Zone, area (6)
I believe the answer is:
region
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">zone</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that zone can be written as region)</span><br/ ><br/ >'<span class="explanation-format__original">area</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that area can be written as region)</span><br/ ><br/ ></span>
(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" .)