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All answers having "Stirs up" as clue:

4 Character Answers:

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FANS

GINS

IRES

PEPS



5 Character Answers:

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RILES

ROILS



6 Character Answers:

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ANGERS

AWAKES

RAISES

ROUSES

SPARKS

STOKES

WAKENS



7 Character Answers:

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AROUSES

FOMENTS

INCITES

NETTLES



8 Character Answers:

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AGITATES