Overcriticises a simple photograph (4)

I believe the answer is:

snap

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for snap that I've seen before include "Break off - card-game" , "type of election" , "Crack; bite" , "Family helper" , "Break sharply - a simple card game" .)

I've seen this clue in the Sydney Morning Herald.

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