Weapon to wound girl (7)
I believe the answer is:
cutlass
'weapon' is the definition.
(cutlass is a kind of weapon)
'wound girl' is the wordplay.
'wound' becomes 'cut' (cut is a kind of wound).
'girl' becomes 'lass' (lass can informally mean a girl).
'cut'+'lass'='CUTLASS'
'to' is the link.
(Other definitions for cutlass that I've seen before include "Short, broad-bladed sword" , "Sharp weapon" , "Old sailor's sword" , "Type of sword" , "Pirate's weapon" .)