Zone, area (6)
I believe the answer is:
region
This clue is a double definition.
'zone' is the first definition.
(I know that zone can be written as region)
'area' is the second definition.
(I know that area can be written as region)
(Other definitions for region that I've seen before include "Part of a country" , "Area having definable character" , "Wide area" , "Area - district" , "Tract or area" .)