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All answers having "Shrew" as clue:

3 Character Answers:

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ERD

HAG

NAG



5 Character Answers:

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HARPY

SCOLD

VIXEN



6 Character Answers:

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NAGGER

TARTAR

VIRAGO



7 Character Answers:

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HELLCAT



8 Character Answers:

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HARRIDAN

SPITFIRE



9 Character Answers:

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TERMAGANT