Otherworldly glow (4)
I believe the answer is:
aura
'otherworldly 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 "Supposed emanation surrounding the body" , "'Air, atmosphere (4)'" , "Nimbus" , "Distinctive but intangible quality surrounding a person" , "Glorious glow" .)