Climbing out with game (5)
I believe the answer is:
bingo
'game' is the definition.
(bingo is a game)
'climbing out with' is the wordplay.
'with' indicates a hidden word.
'BINGO' is hidden in the letters of 'climbing out'.
(Other definitions for bingo that I've seen before include "game requiring little ability" , "Voila!" , "Cry on discovering something" , "Game in which "two little ducks" might be called" , "Housey-housey" .)