'Revolver' artist (6)
I believe the answer is:
turner
I believe this clue is a double definition.
'revolver' is the first definition.
(something which turns or revolves)
'artist' is the second definition.
(painter JMW Turner)
(Other definitions for turner that I've seen before include "Pianist's assistant" , "J. M. W. -, English landscape painter" , "J. M. W. -, English eighteenth to nineteenth century painter" , "Artist - wheel?" , "Skilled tradesman or great English painter." .)