“He has cereal for breakfast,” I put in (5)
I believe the answer is:
brian
'he has cereal' is the definition.
The definition suggests a singular noun which matches the answer.
'breakfast i put in' is the wordplay.
'breakfast' becomes 'bran' (I have seen 'Healthy breakfast ' mean 'bran' so perhaps 'breakfast' could also mean 'bran').
'put in' is an insertion indicator.
'bran' going around 'i' is 'BRIAN'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for brian that I've seen before include "snail animated" , "intellect" , "Havergal ---, composer; his Life, Pythons" , "He had a 1979 film "Life"!" , "-- Blessed; -- Eno" .)