Church only brewed tea (6)
I believe the answer is:
ceylon
'tea' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'church only brewed' is the wordplay.
'church' becomes 'CE' (abbreviation for Church of England).
'brewed' indicates anagramming the letters.
'only' anagrammed gives 'ylon'.
'ce'+'ylon'='CEYLON'
Can you help me to learn more?
(Other definitions for ceylon that I've seen before include "Old place" , "Sri Lanka, formerly" , "Former name of Sri Lanka" , "Sri Lanka's former name" .)