Distinct area (6)
I believe the answer is:
sector
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">distinct area</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sector that I've seen before include "Military sub-area" , "A body of people who form part of society or economy" , "District" , "Corset (anag) - part of a circle" , ""Slice" cut from centre of circle" .)