Breakfast time in prison (8)
I believe the answer is:
porridge
I believe this is a double definition.
'breakfast' is the first definition.
(porridge might be eaten for breakfast)
'time in prison' is the second definition.
(porridge is a slang term for time in prison)
(Other definitions for porridge that I've seen before include "Or griped about the dish" , "Spell in jail and breakfast food" , "Boiled oatmeal or prison sentence" , "type of bird" , "Hot breakfast food" .)