We’re breaking out of jug! (4)
I believe the answer is:
ewer
'jug' is the definition.
(I've seen this before)
'we're breaking out' is the wordplay.
'breaking out' indicates anagramming the letters.
'were' with letters rearranged gives 'EWER'.
'of' acts as a link.
(Other definitions for ewer that I've seen before include "Container" , "Water-jar" , "Decorative pitcher" , "Sort of jug" , "water-carrier" .)