British title
I believe the answer is:
sir
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">british title</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 sir that I've seen before include "Formal and deferential address to a man" , "Title for knight or teacher" , "Gentleman's form of address" , "Form of address for a knight" , "Honourable title" .)