Part of corset replaced (6)
I believe the answer is:
'part' is the definition.
(I have seen 'Distinctive part ' mean 'sector' so perhaps 'part' could also mean 'sector')
'corset replaced' is the wordplay.
'replaced' indicates anagramming the letters.
'corset' anagrammed gives 'SECTOR'.
'of' is the link.
(Other definitions for sector that I've seen before include "Quarter - subdivision" , "Military sub-area" , "Distinct part (of, eg, economy)" , "Corset for part of battle area" , "Area of circle between two radii" .)