River vessel (4)
(Other definitions for raft that I've seen before include "Flat structure for travel over water" , "Primitive boat" , "water transport" , "... Lots" , "Flat water craft; great collection" .)
'river vessel' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for canoe that I've seen before include "Small boat for paddling" , "Light, narrow open boat" , "Boat (that can be dug out!)" , "Boat that's paddled" , "Kayak-like boat" .)