Card game - break (4)
I believe the answer is:
snap
This clue is a double definition.
'card game' is the first definition.
(simple card game)
'break' is the second definition.
(I know that snap is a type of break)
(Other definitions for snap that I've seen before include "Snarl at - photograph" , "Lose cool" , "Crack - shot" , "21 [PHOTO]" , "Speak sharply or break suddenly" .)