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All answers having "Big to-do" as clue:

3 Character Answers:

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ROW



4 Character Answers:

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BASH

FLAP

GALA

STIR

TASK



5 Character Answers:

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FUROR

HOOHA

STINK



6 Character Answers:

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HOOPLA

UPROAR



7 Character Answers:

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SHINDIG



8 Character Answers:

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BROUHAHA