Story from monastery heard at the end of mass gathering? (4)

I believe the answer is:

amen

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'end of mass gathering?' is the definition.
'amen' can be an answer for 'end' (I have seen 'End of prayer ' mean 'amen' so perhaps 'end' could also mean 'amen'). I'm not sure about the 'of mass gathering?' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for amen that I've seen before include "Religiously 11 [THE LASTWORD]" , "Conclusion of prayer" , "Word of approval" , "Approve" , "Prayerful last word" .)

I've seen this clue in The Irish Times.

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