Glowing, luminous (7)
I believe the answer is:
radiant
I believe this is a double definition.
'glowing' is the first definition.
(I've seen this before)
'luminous' is the second definition.
(I've seen this in another clue)
(Other definitions for radiant that I've seen before include "Beautiful" , "Sending out light, glowing" , "beaming with joy" , "Brilliant" , "Straight line" .)