Crossword Genius

Lose one's cool in 2 (4)

Ross

I believe the answer is:

snap

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'lose one's cool' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for snap that I've seen before include "Speak irritably; photo" , "Break suddenly and cleanly" , "Break suddenly with cracking sound" , "Snarl at - photograph" , "Break like informal photo" .)

I've seen this clue in The Guardian.
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