Pirate's sword (7)
I believe the answer is:
cutlass
'pirate's sword' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cutlass that I've seen before include "Pirate's weapon" , "Pirate sword" , "Piratical sword" , "Short curved naval sword" , "Curved sailors' sword" .)