Crossword Genius

Tooth engaging a chain (8)

Ross

I believe the answer is:

sprocket

(Other definitions for sprocket that I've seen before include "Wheel projection engaging with hole in, eg, film" , "Part of a wheel" , "Roller with teeth" , "Toothed wheel into which chain sits" , "Toothed wheel driven by chain" .)

I've seen this clue in The Times.
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