I am going to be the odd ball here and not suggest clover. At least not yet. Go with the glyphoshates (roundup) after tilling. Then plant roundup ready beans or corn. Spray roundup as often as needed the first year to control weed population. By fall, if not much is left of the foodplot, till, spray roundup again and try a cereal grain mix. Repeat this for the first two to three years. By the end of that time period, most of the weed seeds in the soil will have been depleted. Then plant your clovers.

An alternate to spraying, would be frequent mowings in the spring and summer to prevent weeds from seeding. Possible tilling the soil a few times inbetween mowings. Then come in and plant cereal crop mix in late summer, early fall.