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All answers having "Muscular spasm" as clue:

3 Character Answers:

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TIC



4 Character Answers:

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CLOG

TALC

TORT



5 Character Answers:

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CRAMP

CRICK

SCONE



9 Character Answers:

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PRECISION



11 Character Answers:

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SCRUMPTIOUS



12 Character Answers:

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NONAGENARIAN