House by church - see change to European dairy product (7,6)
I believe the answer is:
cottage cheese
'dairy product' is the definition.
(I know that cottage cheese is a type of dairy product)
'house by church see change to european' is the wordplay.
'house' becomes 'cottage' (cottage is a kind of house).
'by' is a charade indicator (letters next to each other).
'church' becomes 'ch' (common abbreviation).
'change' indicates an anagram.
'to european' becomes 'E' (abbreviation e.g. EU).
'see' anagrammed gives 'ees'.
'cottage'+'ch'+'ees'+'e'='COTTAGE CHEESE'
(Other definitions for cottage cheese that I've seen before include "Skimmed-milk product" , "Light food" , "dairy produce" , "Product made from skimmed milk curds" , "Simple food" .)