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All answers having "Meaningless talk" as clue:

4 Character Answers:

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BOSH

HOKE

JIVE



7 Character Answers:

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PRATTLE



8 Character Answers:

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CLAPTRAP

FOLDEROL

NONSENSE



9 Character Answers:

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RIGMAROLE



10 Character Answers:

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BABBLEMENT

BALDERDASH

EMPTYWORDS

FLAPDOODLE

GALIMATIAS

HOCUSPOCUS

MUMBOJUMBO



11 Character Answers:

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ABRACADABRA

FIDDLEDEDEE

JABBERWOCKY



12 Character Answers:

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BLATHERSKITE

GOBBLEDEGOOK



13 Character Answers:

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HORSEFEATHERS