Wheel engaging with, eg, film (8)

I believe the answer is:

sprocket

(Other definitions for sprocket that I've seen before include "Wheel projection engaging with hole in, eg, film" , "Toothed wheel that interlocks with a chain" , "Toothed wheel driven by chain" , "Series of teeth on wheel engaging with chain" , "Tooth on a wheel in film projector" .)

I've seen this clue in The Times.

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