Crossword Genius

One supportive of an artist's views? (5)

Ross

I believe the answer is:

easel

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'one' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

I can't explain the remainder of the clue.

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(Other definitions for easel that I've seen before include "artistic aid" , "Stand in a studio" , "Support for artist's canvas" , "Van Gogh's stand?" , "Tripod supporting a canvas" .)

I've seen this clue in the Evening Standard.
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