Drunk had claret in church (9)
I believe the answer is:
cathedral
'church' is the definition.
(I know that cathedral is a type of protestant cathedral)
'drunk had claret' is the wordplay.
'drunk' indicates anagramming the letters.
'had'+'claret'='hadclaret'
'hadclaret' is an anagram of 'CATHEDRAL'.
'in' acts as a link.
(Other definitions for cathedral that I've seen before include "edifice" , "Bishop's seat" , "One would be in the city" , "Car halted badly at the large church" , "religious site" .)