Feedbag contents (4)
I believe the answer is:
oats
'feedbag contents' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oats that I've seen before include "Edible grass seeds" , "Grain for porridge" , "Porridge ingredient" , "Hardy cereals eaten by horses" , "Cereal food for horses" .)