Care to elaborate on the clover?
Think of it as fall planted clover plot with a WR nurse crop. The WR will germinate immediately and can grow in much colder temps than the clover. Much of the clover germinates in the fall, but depending on conditions you might not get much growth. In the case of fall overseeding with WR and frost seeding clover, you have a similar situation except you have some established clover in the field.
With a new fall planted clover mowing the first spring is even more important since you don't have any established clover in the field. The clover take off in the spring and so does the WR. Perennial clover is slow to establish. Some varieties, like Durana, is slower than others. The newly seeded clover is spending most of its energy establishing a root system that first summer. The WR quickly becomes unpalatable to deer but it takes up space that summer weeds would otherwise occupy and has a chemical effect on some weed seed reducing germination rates. If the WR stand is thick and you let it get too big, it shades out the young clover retarding its growth. If you don't have a nurse crop of WR, the clover is competing with weeds and since some weeds are perennial (unlike WR) they are always competing with them.
So, the objective of mowing in the spring is to release the clover from the shading of the winter rye without killing the rye. This gives the clover time to establish. Eventually, the WR will die on its own and the established clover will fill in.
When I plant a fall mix, it may contain other seed other than just the clover and WR. Depending on what I'm trying to accomplish I may include GHR or some other component. I reduce the amount of WR in the mix when I do this. The nurse crop of WR can be seeded at anywhere between about 50 and 100 lbs/ac. This seeding rate impacts how much the WR shades out the clover in the spring.
If the amount of WR is low enough, you can even let the WR head out without mowing. This approach has less weed combatting capability than broadcasting higher rates of WR and mowing on a timely basis. Different locations and situations may need more or less weed control than others.
So, when I say "each time the WR hits a foot or so mow it back to 6 to 8 inches", it is a generalization assuming a heavy WR seeding rate. In my area, lower growing clovers fit well. Ladino is less expensive but is not as persistent or drought resistant as Durana. You don't want to stress the clover while it is establishing. Mowing too low, especially in dry conditions will stress it. With ladino I don't like to get much lower than 8". Rain may be in the forecast but it doesn't always come as expected. Durana is a bit more tolerant and if I have rain the forecast I'll mow it to 6". There are other clovers that are taller growing than these. You may want to mow even higher for those. What you are really looking for is to make sure the clover gets sufficient sun without advantaging weeds.
Thanks,
Jack