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All answers having "To-do" as clue:

3 Character Answers:

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ADO

ROW



4 Character Answers:

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FLAP

FUSS

SPAT

STIR

TASK



5 Character Answers:

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EVENT

FUROR

HOOHA

SCENE

SCRAP

STINK



6 Character Answers:

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FRACAS

FURORE

HASSLE

HOOPLA

HUBBUB

UPROAR



8 Character Answers:

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BROUHAHA



9 Character Answers:

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COMMOTION



10 Character Answers:

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EXCITEMENT