Move the jug of porridge (4)

I believe the answer is:

stir

This clue is a triple definition!

'move' is the first definition.
(stir can mean to make a movement)

'the jug' is the second definition.
(both are slang for prison)

'of' acts as a link.

'porridge' is the third definition.
(both are slang terms for prison)

(Other definitions for stir that I've seen before include "Act as an agitator" , "Wake; disturbance" , "A slangy prison - whisk it" , "Slight movement" , "Produce disorder < , wake up" .)

I've seen this clue in the Evening Standard.

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