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All answers having "Annoying person" as clue:

3 Character Answers:

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GIT



4 Character Answers:

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BOZO

PAIN

PEST

TWIT



5 Character Answers:

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IRKER

TWERP



6 Character Answers:

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GADFLY

NOODGE



7 Character Answers:

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SOANDSO

VARMINT



8 Character Answers:

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PERISHER