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All answers having "Light-hearted" as clue:

3 Character Answers:

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FUN

GAY



4 Character Answers:

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AIRY

GLAD

THAW



5 Character Answers:

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MERRY

NYLON



6 Character Answers:

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BLITHE

BREEZY



7 Character Answers:

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PLAYFUL



8 Character Answers:

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CAREFREE

CHEERFUL

VOLATILE



9 Character Answers:

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FANCYFREE

FOOTLOOSE



12 Character Answers:

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DEVILMAYCARE

HAPPYGOLUCKY