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All answers having "Cad" as clue:

3 Character Answers:

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CUR

RHO



4 Character Answers:

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HEEL

JERK

LOUT

RAKE

ROUE

SEEK

WORM



5 Character Answers:

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BEAST

CREEP

KNAVE

LOUSE

ROGUE

ROTER

SWINE



6 Character Answers:

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ROTTER



7 Character Answers:

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BOUNDER

DASTARD

TREACLE

TREASON



9 Character Answers:

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SCOUNDREL



10 Character Answers:

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BLACKGUARD

NEERDOWELL