Historically, make good porridge? (2,3,4)
I believe the answer is:
at one time
'historically' is the definition.
(at some point in history)
'make good porridge?' is the wordplay.
'make good' becomes 'atone' (to atone is to make good on a mistake).
'porridge?' becomes 'time' (porridge is slang for time in prison).
'atone'+'time'='AT ONE TIME'
(Other definitions for at one time that I've seen before include "in former days" , "in concert" , "together" , "Taking place simultaneously" , "in the past" .)