Passenger boat (5)
I believe the answer is:
ferry
'passenger boat' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ferry that I've seen before include "Ship for crossings" , "Boat for transferring people across short stretches of water" , "Transport boat that plies regularly" , "Boat that carries clients across a stretch of water" , "Scheduled passenger ship" .)