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All answers having "Aggravate" as clue:

3 Character Answers:

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IRK

VEX



4 Character Answers:

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RILE

ROIL



5 Character Answers:

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ANNOY

EATAT

PEEVE

UPSET

YEARN



6 Character Answers:

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HASSLE

NETTLE



7 Character Answers:

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INFLAME



8 Character Answers:

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EMBITTER

IRRITATE



9 Character Answers:

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MAKEWORSE



10 Character Answers:

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EXACERBATE