Many a tourist will use it snappily (6)

I believe the answer is:

camera

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'it snappily' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for camera that I've seen before include "Taker of pictures" , "optical device" , "Brownie maybe" , "Picture taker" , "shooter" .)

I've seen this clue in the Evening Standard.

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