Mark of social disgrace (6)
I believe the answer is:
stigma
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mark of social disgrace</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 stigma that I've seen before include "Disgraceful mark" , "Blot" , "Mark of dishonour" , "A stain as on character" , "Brand or mark of infamy" .)