Man or Wight (4)
I believe the answer is:
isle
This clue is a double definition.
'man' is the first definition.
(I've seen this before)
'wight?' is the second definition.
(I've seen this in another clue)
(Other definitions for isle that I've seen before include "'This scepter'd - - (Shakespeare)" , "Ireland, perhaps" , "Detached territory" , "Land cut off by water" , "Said of Sheppey, Dogs, Wight or Man?" .)