Passenger vessel (5)
'passenger vessel' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for liner that I've seen before include "cover for interior" , "Craft" , "Removable inner skin or large passenger ship" , "may be demonstrated by make-up artist" , "Seagoing vessel - goes with bin, eye or hard" .)
(Other definitions for ferry that I've seen before include "Passenger vessel operating on a regular schedule" , "Carry over water" , "Boat across river" , "Boat that carries clients across a stretch of water" , "Cross-channel service" .)