Archbishop given porridge not a moment too soon (4,2,4)
I believe the answer is:
just in time
'archbishop given porridge not a moment too soon' is the definition.
I can't tell whether this defines the answer.
'given porridge not a moment too soon' is the wordplay.
'given' means one lot of letters go next to another.
'porridge' becomes 'time' (porridge is slang for time in prison).
'not a moment too soon' becomes 'justin' (I can't justify this - if you can you should give a lot more credence to this answer).
'time' put after 'justin' is 'JUST-IN-TIME'.
Can you help me to learn more?
(Other definitions for just in time that I've seen before include "At the last possible moment" , "I met Justin (anag.)" .)