Meat from cattle (4)
I believe the answer is:
beef
'meat from cattle' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for beef that I've seen before include "Brawn; complaint" , "it's unacceptable for vegetarian" , "Grumble - muscle" , "Grumble over cattle meat?" , "Complain; meat" .)