Concentrate in German city church (7)
I believe the answer is:
essence
'concentrate' is the definition.
(thesaurus)
'german city church' is the wordplay.
'german city' becomes 'essen' (I've seen this before).
'church' becomes 'ce' (abbreviation for Church of England).
'essen'+'ce'='ESSENCE'
'in' is the link.
(Other definitions for essence that I've seen before include "Intrinsic nature (of something)" , "A thing's intrinsic nature" , "Basic quality" , "Nitty-gritty" , "Extract; intrinsic nature" .)