Sword that's wounded girl (7)
I believe the answer is:
cutlass
'sword' is the definition.
(type of sword)
'wounded girl' is the wordplay.
'wounded' becomes 'cut' (I've seen this before).
'girl' becomes 'lass' (lass can informally mean a girl).
'cut'+'lass'='CUTLASS'
'that's' acts as a link.
(Other definitions for cutlass that I've seen before include "Type of sword" , "could hurt one, in the main" , "Curved sailors' sword" , "Short broad sword" , "Short curved naval sword" .)