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All answers having "Spectacular" as clue:

3 Character Answers:

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FAB



4 Character Answers:

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EPIC

SHOW



5 Character Answers:

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GREAT



6 Character Answers:

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SCENIC



7 Character Answers:

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AWESOME

SPLASHY



8 Character Answers:

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DYNAMITE

THEATRIC



9 Character Answers:

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ARRESTING



10 Character Answers:

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THEATRICAL



12 Character Answers:

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AWEINSPIRING

BREATHTAKING

EXTRAVAGANZA