Not a sign of a fatal wound (4)
I believe the answer is:
scar
'wound' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for scar that I've seen before include "Nasty mark" , "Remnant of wound" , "Evidence of a past injury?" , "Cicatrice" , "Disfigure" .)