Transport gold on a vessel (7)
I believe the answer is:
gondola
'vessel' is the definition.
(I know that gondola is a type of boat)
'transport gold on a' is the wordplay.
'transport' is an anagram indicator (letters are transported elsewhere).
'gold'+'on'='goldon'
'goldon' is an anagram of 'gondol'.
'gondol'+'a'='GONDOLA'
(Other definitions for gondola that I've seen before include "Cabin suspended from an airship" , "Palmieris' craft" , "Venetian vessel" , "Craft for Venetian canals" , "Venetian boat - airship car" .)