A support, often of canvas (5)

I believe the answer is:

easel

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'canvas' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for easel that I've seen before include "Lease it out to the artist" , "Standing supporter" , "Artist's wooden frame" , "artistic aid" , "Stand used by artists" .)

I've seen this clue in the Evening Standard.

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