Crossword Genius

Mechanical device that could make one chatter (7)

Ross

I believe the answer is:

ratchet

'mechanical device' is the definition.
(I know that ratchet is a type of mechanical device)

'could make one chatter' is the wordplay.
'could make' indicates anagramming the letters.
'chatter' with letters rearranged gives 'RATCHET'.

'that' acts as a link.

(Other definitions for ratchet that I've seen before include "Chatter about notch on wheel" , "Chatter (anag)" , "Device promoting One Direction" , "One-way mechanism" , "Toothed device allowing unidirectional movement" .)

I've seen this clue in The Telegraph.
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