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All answers having "Surgical knife" as clue:

3 Character Answers:

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ERA



5 Character Answers:

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ANNUL

SUITE



6 Character Answers:

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BAFFLE

LANCET



7 Character Answers:

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SCALPEL



8 Character Answers:

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BEARSKIN

BISTOURY

TOWNHALL



13 Character Answers:

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INCONCEIVABLE