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All answers having "Uncle ___" as clue:

3 Character Answers:

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BEN

NED

SAM

SAY

TOM



4 Character Answers:

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BENS

STOP



5 Character Answers:

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IGIVE

ILOSE

IQUIT

REMUS

SAYIT

VANYA



6 Character Answers:

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ENOUGH



7 Character Answers:

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IGIVEIN



8 Character Answers:

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ICONCEDE



10 Character Answers:

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ISURRENDER