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All answers having "Despicable person" as clue:

3 Character Answers:

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CUR

RAT



4 Character Answers:

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SNOT

TOAD



5 Character Answers:

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LOUSE

TWERP

WHINE



6 Character Answers:

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SLEAZO

TOERAG

WRETCH



7 Character Answers:

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SOANDSO



9 Character Answers:

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SLEAZEBAG