Friendly relationship? It centred on brewing English beer bottles (7,8)
I believe the answer is:
entente cordiale
'friendly relationship?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'it centred on brewing english beer bottles' is the wordplay.
'brewing' indicates an anagram.
'english' becomes 'E' (abbreviation).
'beer' becomes 'ale' (type of beer).
'bottles' indicates putting letters inside (bottle can mean to contain).
'e'+'ale'='eale'
'it'+'centred'+'on'='itcentredon'
'itcentredon' anagrammed gives 'ntentecordi'.
'ntentecordi' put into 'eale' is 'ENTENTE CORDIALE'.
Can you help me to learn more?
(Other definitions for entente cordiale that I've seen before include "Agreement" , "Understanding" .)