Nothing...Just mow right before the season presuming it is a perennial clover Unless you have a specific noxious weed problem, skip the herbicides. Many broadleaf weeds are as good or better deer food as the clover. The weeds will help shade it from the summer heat. Deer don't need a clean field. Most clovers are cool season crops. The idea we need farm looking fields for deer is strange.
Start with objectives...Why did you plant the field. As part of a QDM program? For attraction during the season to improve hunting?
I like to start with a nice burn down in the fall and plant clover with a winter rye nurse crop. The first spring, I mow the WR to release the clover. Durana works well in your area and mine. After that, I only mow in the fall before the season. You couldn't even tell there was clover in my fields during the summer from a distance because of the weeds. After the fall mowing, when the nights get cool and we get fall rain, the clover bounces back and dominates the field.
Herbicides, short of a specific noxious weed problem, are a waste of time on clover. You are fighting a loosing battle. Nature abhors a monoculture. As the clover fixes more and more N into the soil, the field becomes more and more attractive to grasses. Eventually, they will win. With common ladino clover, I get 5 years or so out of a field before I need to rotate into an N seeking crop. With Durana, I get 7 to 10 years.
Thanks,
Jack