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All answers having "Agitates" as clue:

4 Character Answers:

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EATS



5 Character Answers:

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FRETS

RILES

ROILS

STIRS



6 Character Answers:

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CHURNS

ROUSES



7 Character Answers:

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FOMENTS

RILESUP

STIRSUP



8 Character Answers:

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FERMENTS