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All answers having "Fitful" as clue:

5 Character Answers:

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EIGHT



6 Character Answers:

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SPHERE



7 Character Answers:

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SPASTIC



8 Character Answers:

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SPORADIC



9 Character Answers:

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SPASMODIC



10 Character Answers:

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SPUTTERING



15 Character Answers:

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ONAGAINOFFAGAIN