Crack the game (4)
I believe the answer is:
snap
I believe this is a double definition.
'crack' is the first definition.
(synonyms)
'game' is the second definition.
(card game)
'the' is the link.
(Other definitions for snap that I've seen before include "unexpected? > Same here!" , "Simple card game - gotcha!" , "sometimes preceded by brandy" , "Family helper" , "Click! - a photograph!" .)