Crossword Genius

Sinister smiles (6)

Ross

I believe the answer is:

sneers

(Other definitions for sneers that I've seen before include "Makes scornful remark, derides" , "Shows scorn" , "Shows contempt by scornful expression" , "Smiles contemptuously" , "Jeers, derides" .)

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