Grouse meat (4)
I believe the answer is:
beef
I believe this clue is a double definition.
'grouse' is the first definition.
(synonyms)
'meat' is the second definition.
(beef is a kind of meat)
(Other definitions for beef that I've seen before include "Complaint; muscle" , "gripe" , "Grouse - meat" , "Strength - grievance" , "Meat of the cow" .)