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All answers having "Aggravates" as clue:

4 Character Answers:

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IRKS



5 Character Answers:

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RILES



6 Character Answers:

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EATSAT

EATSUP

GETSTO



7 Character Answers:

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BOTHERS

RILESUP



9 Character Answers:

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EMBITTERS

IRRITATES



10 Character Answers:

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MAKESWORSE