Complain about the game? (6)
I believe the answer is:
grouse
This clue is a double definition.
'complain' is the first definition.
(grousing is a kind of complaining)
'the game?' is the second definition.
(I've seen this before)
'about' is the link.
(Other definitions for grouse that I've seen before include "Gripe; game bird" , "Plump game bird" , "Bellyache" , "Grumble like game-bird" , "Petty complaint" .)