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All answers having "Heebie-jeebies" as clue:

5 Character Answers:

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AGITA

DREAD



6 Character Answers:

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CREEPS

FRIGHT

UNEASE



7 Character Answers:

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JIMJAMS

JITTERS

WILLIES



11 Character Answers:

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JGLEDNERVES



13 Character Answers:

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JANGLEDNERVES