Vessel sunk at the bar (8)
I believe the answer is:
schooner
'vessel' is the definition.
(type of ship)
'sunk at the bar' is the wordplay.
I cannot quite understand how this works, but
'at' could be 'on' (location) and 'on' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for schooner that I've seen before include "Large beer or sherry glass" , "Two-masted sailing ship" , "Old sailing vessel and large glass" , "Two-master; a glass" , "A measure or glass for sherry" .)