Farm fodder (6)
I believe the answer is:
silage
'farm fodder' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for silage that I've seen before include "Animal food" , "Animal fodder harvested while green and partially fermented" , "Animal foodstuff" , "Partially fermented grass fodder" , "Preserved fodder for cattle" .)