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All answers having "Nettle" 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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ANGER

ANNOY

EATAT

NAGAT

PEEVE

PIQUE

RAMIE

TEASE



7 Character Answers:

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PROVOKE



8 Character Answers:

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IRRITATE



10 Character Answers:

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EXASPERATE