A mark left by a healed wound (4)
I believe the answer is:
scar
'a mark left by a healed wound' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for scar that I've seen before include "Permanent mark left by a wound" , "Fish" , "Mark left by old wound" , "Healed-cut mark" , "showing effect of damage to body" .)