A lot depends on what other greens you are feeding in addition to the clover. Clover on its own is pretty rich. If you have any of the following to feed along with it, they will help prevent diarrhea: leaves of raspberry, blackberry and strawberry, shepherd's purse and plantain.
http://en.wikipedia.org/wiki/Plantago_major
http://en.wikipedia.org/wiki/Capsella_bursa-pastoris
If you have more clover available than you can use fresh, why not dry the rest for times when greens are scarce or you don't have time to gather? Air-dried clover is excellent, high protein hay.
You need to identify the "clover" with the yellow flowers. There are a number of plants it could be. It could be burr clover, hop clover, black medic. bird's foot trefoil... there was a recent thread discussing these.
Okay, found the thread:
burr-clover-t2779.html