Reflected light (6)
I believe the answer is:
lustre
'reflected light' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for lustre that I've seen before include "Sheen or renown" , "Rustle up the sheen" , "Brilliant quality in a material, porcelain, etc" , "Glory, distinction" , "Result (anag) -- gloss" .)