Angelic aura (4)
I believe the answer is:
halo
'angelic aura' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for halo that I've seen before include "Ring of light round head" , "Luminous sign of saintliness" , "Sign of a saint" , "Circle of (holy) light" , "Circle of light round the sun or moon" .)