Eddy to turn to game (9)
I believe the answer is:
whirlpool
'eddy' is the definition.
(I know that eddy can be written as whirlpool)
'turn to game' is the wordplay.
'turn' becomes 'whirl' (whirl is a kind of turn).
'to game' becomes 'pool' (pool is a kind of game).
'whirl'+'pool'='WHIRLPOOL'
'to' acts as a link.
(Other definitions for whirlpool that I've seen before include "Strong circular current" , "Violent circular eddy of water" , "Quickly rotating mass of water" , "Powerful circular current of water" .)