Senior diplomat (10)
I believe the answer is:
ambassador
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">senior diplomat</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 ambassador that I've seen before include "Messenger" , "diplomatic type" , "foreign agent" , "Overseas diplomat" , "In a different case, he could be" .)