Jug of porridge! (4)
This clue is a double definition.
'jug' is the first definition.
(both are slang for prison)
'porridge?' is the second definition.
(both are slang terms for prison)
'of' is the link.
(Other definitions for stir that I've seen before include "What keeps those inside" , "Produce disorder < , wake up" , "Excitement" , "Detention centre" , "Whisk or make a move" .)
I believe this clue is a double definition.
'jug' is the first definition.
(jug can informally mean a prison)
'porridge' is the second definition.
(British slang)
'of' is the link.
(Other definitions for prison that I've seen before include "Place of detention for criminals" , "Slammer" , "Jail" , "Eg, Wormwood Scrubs" , "Place of confinement" .)