The play is on the difference in height between what you hope to kill and what you wish to save. And, if you have some weeds the same height of your clover they survive. Having said that....
I prefer this means of weed control in clover. Fill the sucker with glyphosate and roll. No worries with adjuvants or crop oils. It works on grasses and broadleaf weeds. The rate of coverage per quart of glyphosate is phenomenal. I know, cost doesn't matter, but if you have any reservations about how much pesticide you use and the POTENTIAL adverse effects this just might be your baby!