Crossword Genius

A game of quick decision (4)

Ross

I believe the answer is:

snap

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'a game' is the definition.
(card game)

I don't understand the remainder of the clue.

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(Other definitions for snap that I've seen before include "Take a photo" , "Simple card game - gotcha!" , "Break sharply - a simple card game" , "Unpremeditated - bite" , "unexpected? > Same here!" .)

I've seen this clue in the Evening Standard.
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