Composer about to be supported by board (6)

I believe the answer is:

chopin

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'composer' is the definition.
(Frederic Chopin)

I cannot understand how the remainder of the clue works.

(Other definitions for chopin that I've seen before include "Composer of mainly piano works" , "Romantic figure" , "Frederic . . . . . ., great Polish composer-pianist" , "Polish virtuoso composer" , "Polish pianist-composer" .)

I've seen this clue in The Telegraph.

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