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All answers having "Jittery" as clue:

4 Character Answers:

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EDGY



5 Character Answers:

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ANTSY

JUMPY

SCOUR

TENSE

WIRED



6 Character Answers:

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ONEDGE

SCARED



7 Character Answers:

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NERVOUS

RESTIVE

UPTIGHT



8 Character Answers:

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UNSTRUNG



9 Character Answers:

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ILLATEASE

INADITHER