Reflected light (6)
I believe the answer is:
lustre
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reflected light</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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" .)