Evidently cereal repast (7)
I believe the answer is:
oatmeal
'evidently cereal repast' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'cereal repast' is the wordplay.
'cereal' becomes 'oat' (oat is a kind of cereal).
'repast' becomes 'meal' ('meal' can be a synonym of 'repast').
'oat'+'meal'='OATMEAL'
Can you help me to learn more?
(Other definitions for oatmeal that I've seen before include "Powdery substance eaten" , "The stuff porridge is made from" , "Basis of porridge" , "Sort of beige" , "greyish-yellow colour" .)