Moving around in a jug (5)
I believe the answer is:
astir
'moving around' is the definition.
(I've seen this in another clue)
'a jug' is the wordplay.
'jug' becomes 'stir' (both are slang for prison).
'a'+'stir'='ASTIR'
'in' acts as a link.
(Other definitions for astir that I've seen before include "Starting to move" , "abroad" , "Moving; out of bed" , "Excited; out of bed" , "In a state of movement" .)