Support for the board (5)

I believe the answer is:

easel

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'support' is the definition.
(easel is a kind of support)

I don't understand the remainder of the clue.

(Other definitions for easel that I've seen before include "Artist's equipment" , "Artist's canvas holder" , "artistic aid" , "Stand used by artists" , "supporter of the arts" .)

I've seen this clue in The Globe and Mail.

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