Stir where one does porridge (6)
I believe the answer is:
prison
This clue might be a double definition.
'stir' is the first definition.
(I've seen this in another clue)
'one does porridge' is the second definition.
'prison' can be an answer for 'porridge' (British slang). I am not sure about the 'one does' bit.
'where' is the link.
Can you help me to learn more?
(Other definitions for prison that I've seen before include "Jail" , "Cooler" , "Nick" , "Eg, Wormwood Scrubs" , "punishment" .)