A Barbary Coast pirate (7)
I believe the answer is:
corsair
'a barbary coast pirate' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for corsair that I've seen before include "Seafarer" , "Privateer" , "Pirate from N. Africa" , "20 across" , "A swift pirate ship" .)