Vessel's incomplete journey (3)
I believe the answer is:
urn
'vessel's' is the definition.
(urn is a kind of vessel)
'incomplete journey' is the wordplay.
'incomplete' indicates the answer is hidden within the clue (an incomplete sample of the clue).
'URN' can be found hidden inside 'journey'.
(Other definitions for urn that I've seen before include "A large vase as for human ashes" , "Spore-producing capsule of a moss" , "Run to get Greek vase" , "Container for tea or ashes" , "Tall vase with stem" .)