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All answers having "Cancel" as clue:

3 Character Answers:

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AXE

BAG

END

NIX



4 Character Answers:

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ANNU

DELE

DROP

KILL

NULL

PULL

UNDO

VOID

XOUT



5 Character Answers:

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ABORT

ANNUL

CEASE

ERASE

IXNAY

PROUD

REMIT

SCRAP

SCRUB



6 Character Answers:

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DELETE

EFFACE

NEGATE

REPEAL

REVOKE

TEARUP



7 Character Answers:

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ABOLISH

CALLOFF

FORGIVE

MARKOUT

NULLIFY

REDLINE

RESCIND

SCRATCH

VOIDOUT



8 Character Answers:

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DISANNUL

WRITEOFF



10 Character Answers:

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OBLITERATE