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All answers having "Have" as clue:

3 Character Answers:

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EAT

FUN

HAE

NOT

OWN

RUN



4 Character Answers:

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ACOW

ATIT

AVEZ

HAST

SOME

TAKE



5 Character Answers:

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ABALL

ACARE

AGOAT

ITOUT



6 Character Answers:

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AHEART



7 Character Answers:

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NOTNEED

POSSESS

UNDERGO



13 Character Answers:

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AUXILIARYVERB