Long overcoat (6)
I believe the answer is:
ulster
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">long overcoat</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 ulster that I've seen before include "A heavy coat" , "Overcoat; Irish region" , "Ancient northern Irish kingdom" , "Overcoat; N. Ireland" , "former province of Ireland" .)