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All answers having "Broadway hit" as clue:

4 Character Answers:

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BOFF

CATS

HAIR

MAME

RENT



5 Character Answers:

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ANNIE

EVITA

SMASH



6 Character Answers:

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GREASE

IDOIDO



7 Character Answers:

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CAMELOT

SELLOUT

TUBATWO



8 Character Answers:

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MARYMARY

OKLAHOMA



9 Character Answers:

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FUNNYGIRL



12 Character Answers:

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MILKANDHONEY



15 Character Answers:

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THESOUNDOFMUSIC