Distinct area (6)
I believe the answer is:
sector
'distinct area' is the definition.
(I've seen this before)
This is all the clue.
(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" .)