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All answers having "Make merry" as clue:

4 Character Answers:

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STIR



5 Character Answers:

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ELATE

REVEL



6 Character Answers:

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CAVORT



7 Character Answers:

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CAROUSE

JOLLIFY

ROISTER



9 Character Answers:

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CELEBRATE



15 Character Answers:

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KICKUPONESHEELS