Man, perhaps, insulted regularly (4)
I believe the answer is:
isle
'man perhaps' is the definition.
(Isle of Man is an example)
'insulted regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'insulted' are 'ISLE'.
(Other definitions for isle that I've seen before include "Small region of land" , "description of Britain" , "Said of Sheppey, Dogs, Wight or Man?" , "Isolated land" , "Eg, Sheppey" .)