Enveloping glow
I believe the answer is:
aura
'enveloping glow' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aura that I've seen before include "Intangible quality surrounding a person or thing" , "Ambience; vibes" , "Distinctive but intangible quality surrounding a person" , "Intangible air or quality" , "Occult glow" .)