Crossword Genius

Gear tooth (3)

Ross

I believe the answer is:

cog

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

This is the entire clue.

(Other definitions for cog that I've seen before include "Tooth on the rim of gear wheel" , "Each of series of teeth on wheel" , "Little gearwheel" , "bar" , "One on a gearwheel" .)

I've seen this clue in The Telegraph, the Penny Press, the Sydney Morning Herald, the Newsday, the King Feature Syndicate, the Universal, the USA Today and the LA Times.
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