Sudden muscle contraction (5)

I believe the answer is:

spasm

'sudden muscle contraction' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for spasm that I've seen before include "Jerk" , "Muscular convulsion" , "Convulsion or paroxysm" , "Involuntary muscular contraction" , "Burst" .)

I've seen this clue in The Times, the L.A. Times Daily and the USA Today.

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