Farm animal fed hot food (4)
I believe the answer is:
chow
'food' is the definition.
(chow can informally mean food)
'farm animal fed hot' is the wordplay.
'farm animal' becomes 'cow' (type of farm animal).
'fed' is an insertion indicator (one word is 'fed' to another).
'hot' becomes 'h' (abbreviation eg on taps).
'cow' placed around 'h' is 'CHOW'.
(Other definitions for chow that I've seen before include "breakfast?" , "Long-haired Chinese dog or slangy food" , "Long-haired dog of Chinese breed, or informal food" , "Dog (from China?)" , "Nosh" .)