Quarter of the country (6)
I believe the answer is:
region
I believe this is a double definition.
'quarter' is the first definition.
(thesaurus)
'the country' is the second definition.
(thesaurus)
'of' is the link.
(Other definitions for region that I've seen before include "Area, territory" , "Ignore (anag) -- expanse of land" , "Area of country" , "Area, neighbourhood" , "Tract or area" .)