Game bird is all dressed (9)
I believe the answer is:
billiards
'game' is the definition.
(I know that billiards is a type of table game)
'bird is all dressed' is the wordplay.
'dressed' indicates anagramming the letters ('dress' can mean 'prepare').
'bird'+'is'+'all'='birdisall'
'birdisall' with letters rearranged gives 'BILLIARDS'.
(Other definitions for billiards that I've seen before include "Ball game" , "Game played with balls on table with pockets" , "Game with three balls" , "Indoor sport" , "Table game at which Mary Queen of Scots excelled" .)