Sword hurt girl (7)
I believe the answer is:
cutlass
'sword' is the definition.
(I've seen this before)
'hurt girl' is the wordplay.
'hurt' becomes 'cut' (cut is a kind of hurt).
'girl' becomes 'lass' (lass is a kind of girl).
'cut'+'lass'='CUTLASS'
(Other definitions for cutlass that I've seen before include "Sharp weapon" , "Piratical sword" , "Sailor's blade" , "Pirate's weapon" , "Pirate sword" .)