Crossword Genius

Machine part (3)

Ross

I believe the answer is:

cog

'machine part' 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 component" , "Small gear-wheel" , "Minor player" , "one engaged in revolutionary activity" , "Tooth on the edge of wheel" .)

I've seen this clue in the Penny Press, the Newsday and The Guardian.
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