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All answers having "Guy" as clue:

3 Character Answers:

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JOE

MAC

MAN

RHO



4 Character Answers:

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BOZO

CHAP

DUDE

GENT

MALE

ROPE

STAY



5 Character Answers:

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CABLE

FELLA

STIFF

TEASE



6 Character Answers:

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FELLER

FELLOW

HOMBRE