Church council in controversy no doubt (5)
I believe the answer is:
synod
'church council' is the definition.
(type of church assembly)
'in controversy no doubt' is the wordplay.
'in' indicates a hidden word.
'SYNOD' is hidden in the letters of 'controversy no doubt'.
(Other definitions for synod that I've seen before include "Ecclesiastic council" , "Assembly of the clergy" , "Church assembly" , "Council of bishops" , "cloth gathered here" .)