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All answers having "Well-mannered" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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CRTS

GOOD

NICE

PRIM



5 Character Answers:

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CIVIL

COUTH



6 Character Answers:

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ASSESS

MELODY

POLITE

PROPER

URBANE



7 Character Answers:

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GENTEEL



11 Character Answers:

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GENTLEMANLY