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All answers having "Painkiller" as clue:

4 Character Answers:

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BUNK

FULL



5 Character Answers:

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IMPEL

ISSUE

OPIUM



6 Character Answers:

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OPIATE

UNISON

YOUGOV



7 Character Answers:

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ANODYNE

ASPIRIN

CODEINE

FLIPPER

FOLIAGE

SINGLET



8 Character Answers:

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AUDIENCE

DEADENER

DISCIPLE

NEPENTHE



9 Character Answers:

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ANALGESIC

IBUPROFEN



11 Character Answers:

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CONNOISSEUR

PARACETAMOL