We're off to the jug (4)
I believe the answer is:
ewer
'the jug' is the definition.
(type of vessel)
'we're off' is the wordplay.
'off' indicates anagramming the letters.
'were' anagrammed gives 'EWER'.
'to' is the link.
(Other definitions for ewer that I've seen before include "A type of jug" , "Water-jar" , "Oversized jug" , "Big jug" , "water-carrier" .)