Let's go back and think about weed control. We can't do that without considering what makes a weed a weed. I need to make a simple statement and it's not meant to insult any one's intelligence. It's meant to drag the desirable plants into the conversation. We want more of the good stuff annually or over a long period of time and less of the bad stuff that hinders us from growing the good stuff. For both of those actions to occur it's essential to consider all the plants, both good AND bad. What do all plants need? Again, simple enough. Moisture, nutrition, water, and some heat. Each species has it's own personality - its own characteristics. The basic stuff we know, It's a perennial or an annual. It's a broadleaf or a grass. Each plant has an above ground leaf surface and a below ground root system.
Those simple things are at the top of consideration for selecting a contact herbicide (as opposed to a soil applied pre-emergent herbicide). Some herbicides only act (negatively) on grasses. On the other hand, broadleaves can synthesize or digest the herbicide. Vice-versa, grasses can digest some herbicides while broadleaves cannot. And there are the herbicides that don't give a darn.
For any of these herbicides to work - or not work -the plant's system has to be in a vulnerable position. The conditions need to be right for that to occur. Every plant has a time in it's growth cycle where the conditions are right. Those moments are probably less frequent than moments when the conditions are wrong. There's a lot more to it. You need to know your plants.
Let's get to clover specifics and the idea of using glyphosate to get rid of the undesirable weeds. There are many varieties of clover. All are legumes. That's a consideration in herbicide selection. A dose of 2,4-D will badly hurt or kill it (remember, if the conditions are right), but a twist on the chemical structure of 2, 4-D making it 2,4-DB, will (probably) not. The legume's digestive system (will the scientists forgive me) will render the poison harmless. So, while clover is a broadleaf plant, you can kill other broadleaf plants among the clover (Chorus: If the conditions are right). Let's broaden the picture.
Some clovers might be consider annuals or bi-annuals. Like with most short lived plants, there's a lot of top growth relatively less root system. Good plants or bad plants, annuals are easier to kill than a long established perennial.
Long-lived perennial clover varieties, depending on their age, can hardly be killed at all because of the total size of the plant. It's top growth is dwarfed by its supporting root system. For a contact herbicide like 2,4-d or glyphosate to kill clover -- or any other perennial -- the herbicide has to be transported (that's a subject for another day) entirely through the plant's root system. But all you can do is apply the herbicide on the plant leaves. Now you're up against it. Plant leaves have defense systems that allow good stuff (like air and water) in and keep bad stuff out. Think about surfactants and their purpose.
Call a plant's internal transportation system used for moving food and water thru the plant THE BUS. Here's the bad news. THE BUS runs on a limited schedule. Sometimes it doesn't run at all. This is true of all plants and the bus schedule is different in different seasons. Some plants (warm-season) like summer's heat and THE BUS runs really fast then. And it runs really, really fast, like NASCAR fast, sometime after its initial emergence and before the summer doldrums set in. Clover is the opposite. It likes the cool seasons like spring and fall and can actually go to sleep (go dormant) in the hot, dry part of the summer. Then, THE BUS doesn't run at all.
We can play that knowledge to control weeds in clover. Glyphosate needs to ride THE BUS. If you feel the need to control summer annuals (and I question the need, but it depends on your particular circumstances) try some glyphosate. DISCLAIMER / WARNING: I would never use gly on clover I wasn't prepared to lose!
You might even get away with gly on clover in the fall and spring, clover's prime growing periods IF (can I make the IF bigger?) IF it's a well established perennial clover. THE BUS carrying the herbicide will, hopefully, run out of gas before it moves the gly through the entire root system. You'll get some top kill, but the root system still has food and it's greedy. It wants more green so it can replenish is food storehouse. Stealing food reserves is never a good idea, but like with honey, you can take some but leave some behind behind to feed the bees.
I'm not sure I made the point. Gly on clover. There are calls to use a light dose. Good for killing annuals in your clover because annuals have relatively small root systems and a big rate of application isn't necessary. There's a not insignificant probability gly will kill clovers considered annual or bi-annual or newly established stand of perennial clovers. It just depends how fast THE BUS is running when you do the application. Older stands of perennial clovers, those with well established, massive root systems stand a good chance of surviving because THE BUS doesn't have enough fuel to complete the necessary trip.
Good luck and Best Wishes! Peace, good will, and happiness for you this Christmas and every other!