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All answers having "Knight" as clue:

3 Character Answers:

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DUB

SIR



4 Character Answers:

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JEDI



5 Character Answers:

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DURER

PAPAL

TITLE



6 Character Answers:

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ERRANT

SLAYER

TITLES



7 Character Answers:

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PALADIN



8 Character Answers:

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CAVALIER

ERRANTRY



9 Character Answers:

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PROTECTOR



12 Character Answers:

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TITLEDBRITON



14 Character Answers:

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SUGEOFRAPMUSIC



15 Character Answers:

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BASKETBALLCOACH