Marine predator, one in the Caribbean? (6)
I believe the answer is:
pirate
I believe this is a double definition.
'marine predator' is the first definition.
(criminal operating at sea)
'one in the caribbean?' is the second definition.
(as in the Pirates of the Caribbean series)
(Other definitions for pirate that I've seen before include "Robber on the high seas" , "Use (another's work) for profit without permission" , "plagiarist" , "Publish without permission" , "Bandit of the ocean, buccaneer" .)