Crossword Genius

Expression that might accompany a mustache twirl (5)

Ross

I believe the answer is:

sneer

(Other definitions for sneer that I've seen before include "Smile contemptuously" , "Contemptuous remark" , "Speak scornfully" , "Express cynical contempt" , "Contemptuous expression" .)

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