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All answers having "Agrees" as clue:

4 Character Answers:

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NODS



5 Character Answers:

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JIBES



6 Character Answers:

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SAYSOK



7 Character Answers:

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ACCEDES

ASSENTS

COHERES

CONCURS

SAYSYES



8 Character Answers:

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CONSENTS

SAYSAMEN



9 Character Answers:

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GOESALONG