Soft lustre (5)
I believe the answer is:
sheen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">soft lustre</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sheen that I've seen before include "brilliance" , "to the west of Putney" , "actor?" , "Sureface shine" , "Surface shine" .)