Hindquarters (4)
I believe the answer is:
rump
'hindquarters' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for rump that I've seen before include "The buttocks or hind-quarters" , "Cut of meat from the rear" , "Meat (from behind?)" , "Fleshy hindquarters" , "Bottom - cut of steak" .)