Crossword Genius

Twitch seen regularly (3)

Ross

I believe the answer is:

tic

'twitch' is the definition.
(I know that tic is a type of twitch)

I cannot understand how the rest of the clue works.

(Other definitions for tic that I've seen before include "Fuel oil" , "Convulsion" , "Nervous response" , "Facial muscle spasm" , "Nervous movement" .)

I've seen this clue in The Times.
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