Blade wounded girl (7)
I believe the answer is:
cutlass
'blade' is the definition.
(I know that cutlass is a type of blade)
'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'
(Other definitions for cutlass that I've seen before include "Short, heavy curved sword" , "could hurt one, in the main" , "Steel" , "Sword formerly used by sailors" , "Sharp weapon" .)