Area, region (4)
I believe the answer is:
zone
I believe this clue is a double definition.
'area' is the first definition.
(I know that area can be written as zone)
'region' is the second definition.
(I know that zone is a type of region)
(Other definitions for zone that I've seen before include "One of five belts round the earth" , "Area subject to restrictions, parking say" , "A defined area as for particular purpose" , "Area, division" , "District, area" .)