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All answers having "Cutting" as clue:

4 Character Answers:

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ACID

KEEN

SLIP

TART



5 Character Answers:

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ACERB

EDGED

SHARP

SNIDE

SPRIG



6 Character Answers:

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ACIDIC

BARBED

HEWING



7 Character Answers:

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CAUSTIC

EDITING

EROSIVE

MORDANT

SATIRIC

SLICING



8 Character Answers:

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CLIPPING

INCISIVE

LASHINGS

SEVERING

SLASHING

SLITTING



9 Character Answers:

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SARCASTIC