Blemished, marked (7)
I believe the answer is:
stained
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">blemished</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">marked</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for stained that I've seen before include "Soiled" , "Church feature - side sold was wanting (anag)" , "___ glass" , "Like many church windows" , "Marked, discoloured" .)