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All answers having "Flap" as clue:

3 Character Answers:

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ADO

RHO

TAB



4 Character Answers:

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BEAT

SLAT

SNIT

SPAT

STIR

TODO



5 Character Answers:

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SETTO



6 Character Answers:

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RUCKUS

UPROAR



7 Character Answers:

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DABHAND



8 Character Answers:

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IMBECILE



9 Character Answers:

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AGITATION



10 Character Answers:

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OPENMINDED



11 Character Answers:

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GRIDDLECAKE

HULLABALLOO



13 Character Answers:

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WHIPINTHEWIND



15 Character Answers:

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SWAYINTHEBREEZE