Crossword Genius

Fool's involuntary movement (4)

Ross

I believe the answer is:

jerk

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This clue might be a double definition.

'fool's' is the first definition.
(jerk can mean a foolish person)

'involuntary movement' is the second definition.
'jerk' can be an answer for 'movement' (jerk is a kind of movement). I'm not sure about the 'involuntary' bit.

Can you help me to learn more?

(Other definitions for jerk that I've seen before include "Twitch" , "Yank, idiot" , "fool" , "Sudden pull" , "Tug suddenly" .)

I've seen this clue in The Times.
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