I believe the answer is:
'vessel?' is the definition.
(I've seen this before)
'buccaneer's' is the wordplay.
'CAN' is hidden in amongst the letters.
But, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for can that I've seen before include "John" , "Cooler" , "has power" , "Preserve fruit" , "prison" .)