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All answers having "Cheer up" as clue:

4 Character Answers:

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BUOY

PERK



5 Character Answers:

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AMUSE

ELATE

LIVEN

TAKEH



6 Character Answers:

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SOLACE



7 Character Answers:

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ANIMATE

BEHAPPY

ENLIVEN

GLADDEN

HEARTEN



9 Character Answers:

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TAKEHEART



15 Character Answers:

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ELEVATEONESMOOD