Crossword Genius

Toothed rack permitting movement in only one direction (7)

Ross

I believe the answer is:

ratchet

(Other definitions for ratchet that I've seen before include "One-way mechanism" , "Device forcing motion in one direction" , "Chatter about notch on wheel" , "Device consisting a toothed wheel and pawl that allows movement in one direction only" , "Mechanism with a toothed bar or wheel" .)

I've seen this clue in the Sydney Morning Herald.
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