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All answers having "Fab" as clue:

3 Character Answers:

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RAD



4 Character Answers:

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ACES

MARV



5 Character Answers:

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BOFFO

NEATO

SOCKO

SUPER

SWELL



6 Character Answers:

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TERRIF



9 Character Answers:

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WONDERFUL



10 Character Answers:

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SUPERDUPER