Smart girl dismissing knight (4)

I believe the answer is:

chic

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'smart' is the definition.
('chic' can be a synonym of 'smart')

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

(Other definitions for chic that I've seen before include "Fashionable good taste" , "A la mode" , "Well turned out" , "cool" , "In vogue" .)

I've seen this clue in The Independent.

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