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All answers having "Kill" as clue:

3 Character Answers:

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AXE

END

ICE

NIX

ZAP



4 Character Answers:

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DOIN

FRAG

MAUL

SLAY

VETO



5 Character Answers:

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DOUSE

OLIVE

SMITE



6 Character Answers:

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BEHEAD

DEADEN

MURDER

ORCURE

RUBOUT

RUNLET



7 Character Answers:

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EXECUTE

SHUTOFF



9 Character Answers:

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FINISHOFF

SLAUGHTER



11 Character Answers:

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ASSASSINATE



13 Character Answers:

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PUTTOTHESWORD