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All answers having "Annul" as clue:

3 Character Answers:

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KIT



4 Character Answers:

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UNDO

VACE

VETO

VOID



5 Character Answers:

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ERASE

QUASH

SCRAP



6 Character Answers:

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CANCEL

NEGATE

RECALL

REPEAL

REVOKE

VACATE



7 Character Answers:

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ABOLISH

RESCIND



8 Character Answers:

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ABROGATE

OVERRIDE

SETASIDE