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All answers having "Stage" as clue:

3 Character Answers:

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ERA

LEG

MOM

REM



4 Character Answers:

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DAIS

STEP

TIER



5 Character Answers:

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ARENA

EMBER

ENACT

PHASE

PUTON



6 Character Answers:

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PERIOD



7 Character Answers:

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REENACT



9 Character Answers:

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DRAMATIZE



10 Character Answers:

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DOORJOHNNY



11 Character Answers:

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CHOREOGRAPH



12 Character Answers:

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SHOWBUSINESS



15 Character Answers:

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BROADWAYTHEATRE