Crossword Genius

Plastic cable ties and anti-rollback devices on rollercoasters are types of this mechanism (7)

Ross

I believe the answer is:

ratchet

(Other definitions for ratchet that I've seen before include "Device preventing backward motion" , "Device allowing motion in one direction only" , "One-way toothed wheel" , "Device promoting One Direction" , "Mechanism with a toothed bar or wheel" .)

I've seen this clue in The Sunday Times and The Times.
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