Duel souvenir (4)
I believe the answer is:
scar
'duel souvenir' 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 "Cicatrice" , "Long (for)" , "Effect of unpleasant experience" , "Sign of old injury" , "Evidence of an old wound" .)