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All answers having "Stir up" as clue:

3 Character Answers:

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FAN

IRE

RHO



4 Character Answers:

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GOAD

PROD

RILE

ROIL



5 Character Answers:

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AWAKE

EVOKE

GOOSE

RAISE

ROUSE

ROUST

SCALE

STOKE

WAKEN

YUMMY



6 Character Answers:

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AROUSE

AWAKEN

EXCITE

FOMENT

INCITE

JOSTLE

KINDLE

PURIST



7 Character Answers:

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AGITATE

ANIMATE

ENLIVEN

FERMENT

INCENSE

INFLAME

PROVOKE



8 Character Answers:

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ENGENDER

ENKINDLE