Shoot game! (4)
I believe the answer is:
snap
I believe this is a double definition.
'shoot' is the first definition.
(I know that shoot can be written as snap)
'game' is the second definition.
(card game)
(Other definitions for snap that I've seen before include "Quick photograph - impression" , "Speak irritably; photo" , "piece of cake" , "Sudden break" , "Pans out in simple card game" .)