Crossword Genius

A double-dealing game (4)

Ross

I believe the answer is:

snap

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'a double-dealing' is the first definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for snap that I've seen before include "Still" , "Speak irritably; break" , "Quick photograph - impression" , "Informal photograph" , "Picture" .)

I've seen this clue in the Evening Standard.
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