Church gets genuine breakfast (6)
I believe the answer is:
cereal
'breakfast' is the definition.
(I've seen this before)
'church gets genuine' is the wordplay.
'church' becomes 'CE' (abbreviation for Church of England).
'gets' says to put letters next to each other.
'genuine' becomes 'real' (associated in meaning).
'ce'+'real'='CEREAL'
(Other definitions for cereal that I've seen before include "Grass producing an edible grain" , "Eg, wheat, rice" , "Grain crop" , "Edible grain for breakfast" , "Breakfast dish" .)