Card game: suddenly lose it? (4)
I believe the answer is:
snap
I believe this is a double definition.
'card game' is the first definition.
(simple card game)
'suddenly lose it?' is the second definition.
(I've seen this in another clue)
(Other definitions for snap that I've seen before include "Unpremeditated - bite" , "sometimes preceded by brandy" , "Break like simple card game" , "Crack - shot" , "you may take on holiday" .)