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All answers having "Wet blanket?" as clue:

3 Character Answers:

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DEW

RHO



4 Character Answers:

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DRAG

DRIP

MIST

MOPE

PILL

SNOW



6 Character Answers:

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DAMPER



7 Character Answers:

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KILLJOY



8 Character Answers:

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REPROACH



10 Character Answers:

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SPOILSPORT



11 Character Answers:

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PARTYPOOPER