Response from congregation in Sacramento (4)

I believe the answer is:

amen

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'response from congregation' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'in sacramento' is the wordplay.
'in' says the answer is hidden in the clue.
'AMEN' can be found hidden inside 'sacramento'.

Can you help me to learn more?

(Other definitions for amen that I've seen before include "Response to prayer" , "So let it be" , "Name for end to prayer" , "Word at the end of a prayer" , "Final word in prayer" .)

I've seen this clue in The Sun.

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