Light region in glade there also (8)
I believe the answer is:
ethereal
'light' is the definition.
(I've seen this before)
'region in glade there also' is the wordplay.
'region in' says the answer is hidden in the clue.
'ETHEREAL' is hidden within 'glade there also'.
(Other definitions for ethereal that I've seen before include "Light and delicate in appearance, heavenly" , "Extremely delicate and light; otherworldly" , "Impalpable" , "Sublime" , "'Fairy-like, delicate (8)'" .)