Relating to a noble (5)
I believe the answer is:
ducal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">relating to a noble</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 ducal that I've seen before include "Relating to the highest British hereditary title" , "Relating to a nobleman" , "Relating to some nobles" , "Relating to a high peer" , "High-ranking" .)