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All answers having "Casanova" as clue:

4 Character Answers:

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RAKE

ROUE



5 Character Answers:

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LOVER

ROMEO



7 Character Answers:

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AMORIST

PLAYBOY



8 Character Answers:

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LADYSMAN

LOTHARIO

STALLION

VENETIAN



9 Character Answers:

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LADIESMAN



10 Character Answers:

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LADYKILLER



15 Character Answers:

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WINKCONNOISSEUR