Northern Ireland (6)
I believe the answer is:
ulster
'northern ireland' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ulster that I've seen before include "Six, or nine, counties" , "Historic Irish province; heavy overcoat" , "Overcoat; N. Ireland" , "Overcoat; former kingdom in Ireland" , "Long loose overcoat, from the province?" .)