Crossword Genius

Menacing, unnerving (8)

Ross

I believe the answer is:

sinister

(Other definitions for sinister that I've seen before include "Eerie, alarming" , "Threatening; evil-looking" , "Threatening - ominous" , "What is left on bearings" , "Very unpleasant" .)

I've seen this clue in The Times.
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