Parishioners' response (4)
I believe the answer is:
amen
'parishioners' response' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for amen that I've seen before include "Word of agreement" , "Word at the end of a prayer" , "Extremist" , "statement of affirmation" , "Approve" .)