Man lies injured (4)
I believe the answer is:
isle
'man' is the definition.
(I've seen this before)
'lies injured' is the wordplay.
'injured' indicates anagramming the letters.
'lies' anagrammed gives 'ISLE'.
(Other definitions for isle that I've seen before include "Wight, Man or Skye" , "9 ac perhaps" , "Dogs, for example" , "Piece of land in water" , "The Emerald - (Ireland)" .)