Man, say, not completely misleading (4)
I believe the answer is:
isle
'man say' is the definition.
(Isle of Man)
'not completely misleading' is the wordplay.
'not completely' indicates the answer is hidden within the clue.
'ISLE' is hidden in the letters of 'misleading'.
(Other definitions for isle that I've seen before include "Could be Man" , "Wight, Man or Skye" , "inch, perhaps" , "cut-off location" , "Little land" .)