According to Spooner, Starmer put a stop to vessel (4,3)
I believe the answer is:
beer can
'according to spooner starmer' is the definition.
I can't judge whether this defines the answer.
'a stop to vessel' is the wordplay.
'a stop' becomes 'beer' (I can't justify this - if you can you should believe this answer much more).
'to vessel' becomes 'can' (type of container).
'beer'+'can'='BEER CAN'
'put' is the link.
Can you help me to learn more?
(Other definitions for beer can that I've seen before include "source of Dutch courage?" , "Lager container" .)