Vessel - we're bringing stern round (4)
I believe the answer is:
ewer
'vessel' is the definition.
(ewer is a type of jug)
'we're bringing stern round' is the wordplay.
'we're' anagrams to 'EWER'.
Though, I'm not sure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for ewer that I've seen before include "Large pitcher" , "from which liquid may be poured" , "Vessel for pouring" , "Large, wide-mouthed jug" , "Water jug with wide mouth" .)