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All answers having "Do away with" as clue:

3 Character Answers:

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BAN

BAY

ICE

RID



4 Character Answers:

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KILL

SLAY



5 Character Answers:

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ANNUL

ERASE

HEEDS

OFFER

SCRAP

SCRUB

STOIC

TRIED



6 Character Answers:

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CRAFTY

EFFACE

EMBARK

FINISH

REMOVE



7 Character Answers:

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ABOLISH

OBVIATE

ROOTOUT

STRIKER

THROUGH



8 Character Answers:

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SMASHING

SPORADIC



9 Character Answers:

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ELIMINATE

ERADICATE

ONTHINICE



10 Character Answers:

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XTERMINATE



12 Character Answers:

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POINTTOPOINT