Disdain to put a price on a vessel (5)
I believe the answer is:
spurn
'disdain' is the definition.
(synonyms)
'put a price on a vessel' is the wordplay.
'put a price on' becomes 'sp' (I can't justify this - if you can you should believe this answer much more).
'a vessel' becomes 'urn' (urn is a kind of vessel).
'sp'+'urn'='SPURN'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for spurn that I've seen before include "Treat with contempt" , "Refuse with contempt" , "Despise" , "discard" , "Reject scornfully, rebuff" .)