After church, genuine breakfast (6)
I believe the answer is:
cereal
'breakfast' is the definition.
(I've seen this before)
'after church genuine' is the wordplay.
'after' means one lot of letters go next to another.
'church' becomes 'CE' (abbreviation for Church of England).
'genuine' becomes 'real' (similar in meaning).
'ce'+'real' is 'CEREAL'.
(Other definitions for cereal that I've seen before include "Relating to grain" , "Contents of breakfast bowl" , "Edible grain for breakfast" , "Grain crop" , "Breakfast food made from grain" .)