Pirate's sword, perhaps nicked by young woman (7)
I believe the answer is:
cutlass
'pirate's sword' is the definition.
(I've seen this before)
'young woman' is the wordplay.
'young' becomes 'cut' (I am not sure about this - if you are sure you should believe this answer much more).
'woman' becomes 'lass'.
'cut'+'lass'='CUTLASS'
'perhaps nicked by' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for cutlass that I've seen before include "Old sailor's sword" , "Pirate's weapon" , "Sword formerly used by sailors" , "Type of sword" , "Short, broad-bladed sword" .)