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All answers having "Harry" as clue:

3 Character Answers:

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APE

HST

NAG

SON



4 Character Answers:

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RIDE



5 Character Answers:

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BESET

NAGAT



6 Character Answers:

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HARASS

MOLEST

PESTER



7 Character Answers:

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BESIEGE

TORMENT



8 Character Answers:

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REASONER



9 Character Answers:

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KEEPAFTER



15 Character Answers:

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ANNOYREPEATEDLY

CAUSEIRRITATION

LAUDERORHOUDINI

WORRYANDTORMENT