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All answers having "Out-and-out" as clue:

4 Character Answers:

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LANE

PURE



5 Character Answers:

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GROSS

SHEER

STARK

TOTAL

UTTER



6 Character Answers:

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ARRANT

PATENT



7 Character Answers:

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BLATANT



8 Character Answers:

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COMPLETE



13 Character Answers:

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THOROUGHGOING