County of Northern Ireland (6)
I believe the answer is:
antrim
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">county of northern ireland</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 antrim that I've seen before include "N Ireland county of green glens" , "County of Northern Ireland" , "NI county" , "Ulster county" , "County of northeast Ireland" .)