Watercraft (6)
I believe the answer is:
vessel
'watercraft' is the definition.
(I know that watercraft can be written as vessel)
This is the entire clue.
(Other definitions for vessel that I've seen before include "Kind of ship or a kitchen pot (6)" , "Container for liquid or craft for water" , "Ship or large boat" , "Bark, possibly, needing water" , "Watercraft or water container" .)