He gains nothing in an aura of glory (3)
I believe the answer is:
hal
'he' is the definition.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for hal that I've seen before include "Bluff Prince" , "Falstaff's Prince; 2001 computer" , "Falstaff's prince (H.IV)" , "royal prince" , "future Henry V" .)