Like a mocking grin (3)

I believe the answer is:

wry

(Other definitions for wry that I've seen before include "Dry and mocking, or bent out of shape" , "Of facial expression, mocking or twisted" , "Ironically humorous" , "Perverse" , "Of humour, humorous and mocking" .)

I've seen this clue in The New York Times.

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