Crossword Genius

Lose temper over game (4)

Ross

I believe the answer is:

snap

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'game' is the definition.
(card game)

I cannot understand how the rest of the clue works.

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(Other definitions for snap that I've seen before include "Crack; bite" , "Sudden break" , "Break under strain" , "unexpected? > Same here!" , "Family helper" .)

I've seen this clue in The Mirror.
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