Area, zone (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">area</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that area can be written as region)</span><br/ ><br/ >'<span class="explanation-format__original">zone</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that zone can be written as region)</span><br/ ><br/ ></span>
(Other definitions for region that I've seen before include "Tract or area" , "Area, zone" , "Area, territory" , "Ignore (anag) - area" , "Area, location" .)