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All answers having "Shrews" as clue:

4 Character Answers:

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NAGS



6 Character Answers:

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SCOLDS

VIXENS



7 Character Answers:

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NAGGERS

RODENTS

VIRAGOS



8 Character Answers:

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HELLCATS



9 Character Answers:

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HARRIDANS



10 Character Answers:

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TERMAGANTS