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All answers having "Muse" as clue:

4 Character Answers:

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CLIO

PORE

TRIO



5 Character Answers:

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ERATO

FLONG

NICKS

THINK



6 Character Answers:

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PONDER

URANIA



7 Character Answers:

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REFLECT



8 Character Answers:

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RUMINATE



9 Character Answers:

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REMINISCE



13 Character Answers:

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CARBONDIOXIDE