Luminous, radiant (7)
I believe the answer is:
glowing
I believe this clue is a double definition.
'luminous' is the first definition.
(synonyms)
'radiant' is the second definition.
(I've seen this before)
(Other definitions for glowing that I've seen before include "Radiant" , "Giving out steady light" , "Incandescent" , "Lambent, shining" , "like some worms" .)