"Twelfth Night" duke (6)
I believe the answer is:
orsino
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">twelfth night duke</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for orsino that I've seen before include "A Shakespearean role" , "Shakespearean duke" , "Twelfth Night duke" , "A duke, European" , "one in Twelfth Night" .)