Sword injured young woman (7)
I believe the answer is:
cutlass
'sword' is the definition.
(I know that Cutlass is a type of sabre)
'injured young woman' is the wordplay.
'injured' becomes 'cut' (similar in meaning).
'young woman' becomes 'lass' (informal term for a young woman).
'cut'+'lass'='CUTLASS'
(Other definitions for cutlass that I've seen before include "Sword formerly used by sailors" , "could hurt one, in the main" , "Short, broad-bladed sword" , "Pirate's weapon" , "Pirate sword" .)