Crack shot can be cold (4)

I believe the answer is:

snap

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'crack' is the definition.
(I know that crack can be written as snap)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for snap that I've seen before include "Card game for children" , "Break with a crack" , "Break suddenly and cleanly" , "Break under strain" , "Become unhinged" .)

I've seen this clue in The Irish Times.

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