Casually cheerful (6)

I believe the answer is:

blithe

(Other definitions for blithe that I've seen before include "Innocently happy" , "Cheerful and carefree" , "'Hail to thee, ,,,,,, spirit'- Shelley (6)" , "Happy, joyous" , "Gay" .)

I've seen this clue in the Sydney Morning Herald.

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