German in Britain is C of E, not Catholic (7)
I believe the answer is:
anglian
'german in britain' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'c of e not catholic' is the wordplay.
'c of e' becomes 'anglican' (I've seen this before).
'not' is a deletion indicator.
'catholic' becomes 'c' (abbreviation as in RC for Roman Catholic).
'anglican' with 'c' taken away is 'ANGLIAN'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for anglian that I've seen before include "Relating to the Angles" , "of German descent" , "Of the tribe from which?England gets its name" , "English dialect" .)