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All answers having "Prank" as clue:

3 Character Answers:

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GAG

GET



4 Character Answers:

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DIDO

HOAX

JAPE

JEST

LARK



5 Character Answers:

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ANTIC

CAPER

SPOOF

STUNT

TRICK



8 Character Answers:

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ESCAPADE



10 Character Answers:

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SHENANIGAN



11 Character Answers:

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MONKEYSHINE



13 Character Answers:

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PRACTICALJOKE