It discusses things religiously (5)
I believe the answer is:
synod
'it discusses things religiously' is the definition.
The definition suggests a singular noun which matches the answer.
This is the entire clue.
Can you help me to learn more?
(Other definitions for synod that I've seen before include "Ecumenical council" , "Council of clergy to discuss policy" , "Ecclesiastic council" , "Church assembly" , "Council of bishops" .)