Crossword Genius

Turn clockwise, as a screw (7)

Ross

I believe the answer is:

tighten

(Other definitions for tighten that I've seen before include "Stiffen" , "Make harder to undo" , "Make less loose" , "Do this to your belt to economise (7)" , "get tense" .)

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