Slowly moves camera up for photo! (4)

I believe the answer is:

snap

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

I cannot 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 "21 [PHOTO]" , "Informal photograph" , "Break under strain" , "Speak irritably; break" , "Break with a crack" .)

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

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