Crossword Genius

Part of a gear (3)

Ross

I believe the answer is:

cog

'part of a gear' is the definition.
('cog' is part of 'gear')

This is all the clue.

(Other definitions for cog that I've seen before include "Each of series of teeth on wheel" , "Tooth on gearwheel" , "Junior official" , "Wheel with projections" , "Small gear-wheel" .)

I've seen this clue in the USA Today.
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