More of a player perhaps (5)

I believe the answer is:

extra

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'more' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for extra that I've seen before include "An increased amount" , "One has no lines" , "entry on scorecard?" , "One in crowd scene" , "Superfluous" .)

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

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