Carefree (5-7)
'carefree' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for light-hearted that I've seen before include "Cheerful, carefree" , "Playful" , "Not serious" , "Airy and carefree" , "Cheerful, unserious" .)
'carefree' is the definition.
(I know that carefree can be written as happy-go-lucky)
This is the entire clue.
(Other definitions for happy-go-lucky that I've seen before include "Cheerfully irresponsible" , "Easy-going" , "Cheerfully unworried about the future" , "Without a care in the world" , "Carefree" .)
'carefree' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for blithe that I've seen before include "light" , "Careless" , "Heedless" , "'Hail to thee, ,,,,,, spirit'- Shelley (6)" , "Shelley: 'Hail to thee . . . . . . spirit! Bird thou never wert'" .)