Venetian vessel (7)
I believe the answer is:
gondola
'venetian vessel' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for gondola that I've seen before include "Goon lad (anag.)" , "Cabin suspended from an airship" , "Supermarket display unit" , "mountain climber" , "Compartment suspended from an airship" .)