Cereal time (8)
I believe the answer is:
porridge
This clue is a double definition.
'cereal' is the first definition.
(thesaurus)
'time' is the second definition.
(I've seen this before)
(Other definitions for porridge that I've seen before include "Or griped about the dish" , "type of bird" , "Possibly breakfast - time in prison" , "Breakfast cereal dish" , "Stir" .)