Kitchen vessel? (6)
I believe the answer is:
galley
I believe this clue is a double definition.
'kitchen' is the first definition.
(I've seen this before)
'vessel?' is the second definition.
(galley is a kind of vessel)
(Other definitions for galley that I've seen before include "Vessel's kitchen" , "Kitchen on ship or aircraft" , "Trireme" , "in which slaves may have a row?" , "Cookhouse on board" .)