Sign of an old wound (4)
I believe the answer is:
scar
'sign of an old wound' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for scar that I've seen before include "Fish" , "reminder of sword-fight?" , "Gordale - - , Yorks" , "sign of damage" , "Mark on body or tree" .)