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All answers having "Form of entertainment." as clue:

4 Character Answers:

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FILM



5 Character Answers:

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FILMS

MOVIE

OPERA



6 Character Answers:

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BALLET



7 Character Answers:

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THEATRE



8 Character Answers:

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TELECAST



9 Character Answers:

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BURLESQUE



10 Character Answers:

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BRIDGEGAME

IMITATIONS