An unfinished picture frame (5)
I believe the answer is:
easel
'picture frame' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for easel that I've seen before include "Stand in a studio" , "The rest of artists" , "the rest of the paintwork" , "Artistic tripod" , "Lease it out to the artist" .)