For religious reasons, it was established by our neighbours? A mass medium associated with old French country! (6,2,7)
I believe the answer is:
church of england
'for religious reasons it was established by our neighbours? a mass medium associated' is the definition.
I can't judge whether this defines the answer.
'old french country' is the wordplay.
I cannot really understand how this works, but
'old' could be 'o' (common abbreviation eg in OE for Old English) and 'o' is found in the answer.
an anagram of 'french' is 'rchfen' which is within the left over letters.
'country' could be 'land' (synonyms) and 'land' is present in the answer.
The remaining letters 'chug' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'with' acts as a link.
Can you help me to learn more?
(Other definitions for church of england that I've seen before include "Tories on their knees, it was said" , "That's been established for a long time" .)