Game bird and beef (6)
I believe the answer is:
grouse
This clue is a triple definition!
'game' is the first definition.
(I've seen this before)
'bird' is the second definition.
(grouse is a kind of bird)
'and' acts as a link.
'beef' is the third definition.
(I've seen this before)
(Other definitions for grouse that I've seen before include "Bellyache" , "1D [GAMEBIRD] < having grumble" , "Grumble like game-bird" , "Petty complaint" , "Grumble; game bird" .)