Sword? I'm getting it - mark left by wound outside (8)
I believe the answer is:
scimitar
'sword?' is the definition.
(scimitar is a kind of sword)
'i'm getting it mark left by wound outside' is the wordplay.
'getting' is a charade indicator (letters next to each other).
'mark left by wound' becomes 'scar' (I've seen this before).
'outside' indicates putting letters inside.
'im'+'it'='imit'
'imit' going into 'scar' is 'SCIMITAR'.
(Other definitions for scimitar that I've seen before include "Type of sword with curved blade" , "Double-edged sword" , "Steel" , "Curved form of sword" , "Sword with curved blade used by the Turks and Persians" .)