Crossword Genius

Wheel tooth (3)

Ross

I believe the answer is:

cog

'wheel tooth' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for cog that I've seen before include "Machine wheel" , "Junior official" , "Wheel with projections" , "bar" , "Tooth on gearwheel" .)

I've seen this clue in The Sun and the Penny Press.
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