Stays on the stage? (6)

I believe the answer is:

boards

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'the stage?' is the definition.
(an actor 'treads the boards')

I don't understand the remainder of the clue.

(Other definitions for boards that I've seen before include "directors make them up" , "Gets on; the stage (colloq.)" , "panels" , "Adsorb (anag)" , "Tread them in the theatre" .)

I've seen this clue in the Evening Standard.

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