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All answers having "Sophisticated" as clue:

3 Character Answers:

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HEP

KIT

RHO



4 Character Answers:

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AVER

CHIC

POSH

WISE



5 Character Answers:

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AWARE

BLASE

COUTH

SMART

SUAVE



6 Character Answers:

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CLASSY

SKETCH

URBANE



7 Character Answers:

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WORLDLY



12 Character Answers:

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COSMOPOLITAN