The oats are really a hinderence to the clover or alfalfa if you can avoid using them. Most plant oats to because they grow fast and shade out weeds. It's an age old practice and it still works well, however now we have herbicides to do the trick. Your seeding will grow faster without competition from the oats and in a food plot situation...how are you going to remove the oats?
A farmer will often harvest the oats for grain or bale them green but a foodplotter has no way to do that.
If you get a little flush of weeds, you can clip them off above the clover...just don't let them get to thick and heavy or they will suffocate the clover after you mow them.
2-4DB can be used on broadleafs and Poast for grasses if you want to use herbicide.