A revolver found in the art gallery (6)

I believe the answer is:

turner

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'a revolver' is the definition.
(something which turns or revolves)

I don't understand how the remainder of the clue works.

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(Other definitions for turner that I've seen before include "Lathe worker; a water-colourist" , "Prize < for artist" , "JMW ------, English artist renowned for his land- and sea-scapes" , "revolutionary type?" , "British landscape painter - US rock singer, Tina" .)

I've seen this clue in the Evening Standard.

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