Livestock feed (4)
I believe the answer is:
mash
'livestock feed' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mash that I've seen before include "Crush into a soft, pulpy state" , "Pulverise" , "dish of veg" , "Potato dish" , "Accompaniment of bangers" .)