Eerie glow (4)
I believe the answer is:
aura
'eerie 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 "Characteristic air of person" , "Invisible emanation" , "Air, distinctive quality" , "Intangible atmosphere" , "Glorious glow" .)