You and I imprisoned by queen in jug (4)
I believe the answer is:
ewer
'jug' is the definition.
(type of vessel)
'you and i imprisoned by queen' is the wordplay.
'you and i' becomes 'we'.
'imprisoned by' indicates putting letters inside.
'queen' becomes 'ER' (short for Elizabeth Regina ie Queen Elizabeth).
'we' going inside 'er' is 'EWER'.
'in' is the link.
(Other definitions for ewer that I've seen before include "Water jug with wide mouth" , "A wide-mouthed water-jug" , "Pitcher, water jug" , "Big jug" , "A type of jug" .)