Part, subdivision (6)
I believe the answer is:
sector
I believe this clue is a double definition.
'part' is the first definition.
(I have seen 'Distinctive part ' mean 'sector' so perhaps 'part' could also mean 'sector')
'subdivision' is the second definition.
(I have seen 'Subdivision of area ' mean 'sector' so perhaps 'subdivision' could also mean 'sector')
(Other definitions for sector that I've seen before include "Corset (anag) - part of a circle" , "Area, division" , "Pie chart slice shape" , "Division or part" , "Escort in zone" .)