Wife of a marquis (11)
I believe the answer is:
marchioness
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wife of a marquis</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 marchioness that I've seen before include "Noble lady" , "noble wife, perhaps" , "She's entitled" , "Aristocratic lady" , "Female aristocrat" .)