Ethereal glow (4)
I believe the answer is:
aura
'ethereal glow' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aura that I've seen before include "Perception of distinctive personality" , "distinctive impression" , "Distinctive quality (of something or someone)" , "Atmosphere, quality" , "Invisible emanation" .)