Crossword Genius

Quirk of brief noise made by a clock (3)

Ross

I believe the answer is:

tic

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'quirk' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

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(Other definitions for tic that I've seen before include "Nervous habit" , "Muscle twitch" , "Muscular contraction" , "Convulsive spasm" , "Fuel oil" .)

I've seen this clue in The Times.
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