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All answers having "Sever" as clue:

3 Character Answers:

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CUT

HEW

LOP



4 Character Answers:

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CHOP

REND

RIVE

SLIT



6 Character Answers:

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CLEAVE

CUTOFF

DIVIDE

SAWOFF



7 Character Answers:

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CHOPOFF



8 Character Answers:

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DISUNITE