Buccaneer (6)
'buccaneer' is the definition.
(historical term for a pirate)
This is all the clue.
(Other definitions for pirate that I've seen before include "Copyright infringer" , "plagiarist" , "Appropriate stuff" , "Publish without permission" , "Penzance marauder ?" .)
'buccaneer' is the definition.
(corsair is a kind of buccaneer)
This is the entire clue.
(Other definitions for corsair that I've seen before include "Seafarer" , "Pirate (archaic)" , "work by Verdi" , "Marauder" , "20 across" .)