Man has this grim, unfinished vessel docked (7)
I believe the answer is:
douglas
'man' is the definition.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for douglas that I've seen before include "place of Man" , "Manx capital" , "Capital of the Isle of Man" , "bloke" , "IOM town" .)