Washstand vessel (4)
I believe the answer is:
ewer
'washstand vessel' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ewer that I've seen before include "A type of jug" , "Open vessel with handle and spout" , "Large water jug" , "A wide-lipped jug" , "Decorative pitcher" .)