Intrinsic quality of German city church (7)
I believe the answer is:
essence
'intrinsic quality' is the definition.
(I've seen this before)
'german city church' is the wordplay.
'german city' becomes 'essen' (city in Germany).
'church' becomes 'CE' (abbreviation for Church of England).
'essen'+'ce'='ESSENCE'
'of' acts as a link.
(Other definitions for essence that I've seen before include "Core, most vital part" , "Scent; core" , "Indispensable" , "Key" , "Plant extract flavouring" .)