Crossword Genius

Mechanism allowing movement in only one direction (7)

Ross

I believe the answer is:

ratchet

(Other definitions for ratchet that I've seen before include "Device promoting One Direction" , "Chatter about notch on wheel" , "Bar to fit the notches of a toothed wheel" , "Device preventing turning backwards" , "One-way mechanism" .)

I've seen this clue in The Guardian.
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