Place for Holy Communion had claret prepared (9)
I believe the answer is:
cathedral
'place for holy communion' is the definition.
'had claret prepared' is the wordplay.
'prepared' indicates anagramming the letters.
'had'+'claret'='hadclaret'
'hadclaret' with letters rearranged gives 'CATHEDRAL'.
(Other definitions for cathedral that I've seen before include "Place of worship" , "Bishop's seat" , "Large, important church" , "St Paul's or St Patrick's" , "Main church of diocese" .)