Airy (8)
I believe the answer is:
ethereal
'airy' is the definition.
(synonyms)
This is all the clue.
(Other definitions for ethereal that I've seen before include "exquisitely airy" , "Insubstantial, other-worldly" , "Airy or supernatural" , "Extremely delicate and light, not of this world" , "There in lea - it looks delicate" .)