Crossword Genius

Its shutter works snappily (6)

Ross

I believe the answer is:

camera

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for camera that I've seen before include "In - means in private" , "Brownie, among others" , "Photo-taker" , "Snapper?" , "Device for taking photographs" .)

I've seen this clue in the Evening Standard.
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