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All answers having "Ill" as clue:

3 Character Answers:

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WOE



4 Character Answers:

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ABED

BITE

EVIL

SICK



5 Character Answers:

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BADLY

IOTAS

LUTON

OCEAN



6 Character Answers:

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HATRED

LAIDUP

UNWELL



7 Character Answers:

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EPITAPH

POLEMIC

VENISON



8 Character Answers:

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STRICKEN



9 Character Answers:

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INABADWAY



11 Character Answers:

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OPERATIONAL



15 Character Answers:

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UNDERTHEWEATHER