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All answers having "Duke" as clue:

3 Character Answers:

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SCH



4 Character Answers:

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EARL

FIST

GLAD

PEER

UNIV



5 Character Answers:

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BIGOT

DORIS

NOBLE

PEERS

TITLE



6 Character Answers:

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SCHOOL



7 Character Answers:

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PEERAGE



9 Character Answers:

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ELLINGTON

JOHNWAYNE



15 Character Answers:

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BRITISHNOBLEMAN