Crossword Genius

Quirky habit (3)

Ross

I believe the answer is:

tic

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

This is all the clue.

(Other definitions for tic that I've seen before include "Nervous spasm" , "Involuntary muscular spasm" , "Jerky movement" , "Minor muscle spasm" , "Regular muscular twitch" .)

I've seen this clue in The Wall Street Journal, the LA Times and the Newsday.
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