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All answers having "Fits" as clue:

4 Character Answers:

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SITS

TOAT



5 Character Answers:

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AGUES

BOUTS

MEETS

RAGES

SUITS



6 Character Answers:

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ADAPTS

SPASMS



7 Character Answers:

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BELONGS



8 Character Answers:

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SEIZURES

TANTRUMS



9 Character Answers:

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DOVETAILS

HYSTERIAS