Early fall seeded or frost seeded clover does so much for spring grain plots. Soil building, nitrogen fixing, erosion control, deer and turkey food to name some of them. With this combination your options for later on are unlimited, but I'm not big on terminating the grain early, why waste time, diesel fuel and spray money when you have a good crop growing that provides some allopathic weed control, that will terminate itself and release the clover without you doing a thing, and provide seed heads to boot. Ripe standing straw is a great asset for a late summer throw and mow or notill planting. Straw is also an important component of weed suppression, soil conservation and soil building efforts and helps to conserve moisture in a dry spell. These reasons are why small grain is always an important component of crop rotation in organic farming. So I try to rotate late summer brassica into soybeans the next spring, interseed rye and winter wheat into the beans in the fall, frostseed clover into the grain in early spring, clover for a year or two then back into beans or brassica.