Children's card game (3,4)
'children's card game' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for snap that I've seen before include "Photograph - card game" , "Click! - a photograph!" , "Spell of cold weather and card game" , "Lose cool" , "Speak sharply or break suddenly" .)
'children's card game' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for happy families that I've seen before include "It features Mr Bun, the baker, etc" , "Those glad to be at home" , "Children's card game" , "cards?" , "Domestic bliss" .)
(Other definitions for old maid that I've seen before include "She's elderly and unmarried" , "Obsolete expression for elderly unmarried woman" , "Fusspot; card game" , "Pejorative term for elderly unmarried woman" , "Miss" .)