He painted a screw, perhaps? (6)
I believe the answer is:
turner
'he' is the definition.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for turner that I've seen before include "He painted Rain, Steam and Speed - The Great Western Railway" , "Prize < for artist" , "Worker with a lathe, like great English painter" , "Lathe-user" , "Fighting Temeraire artist" .)