Crossword Genius

Photo that’s a match! (4)

Ross

I believe the answer is:

snap

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'photo' is the definition.
(I know that snap is a type of photo)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for snap that I've seen before include "Ginger biscuit" , "Break sharply - a simple card game" , "Speak in a sharp angry tone" , "Short spell" , "Break under strain" .)

I've seen this clue in The Times.
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