Crossword Genius

The last word in prayers! (4)

Ross

I believe the answer is:

amen

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'the last word' is the definition.
(last word in a prayer)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for amen that I've seen before include "Response to prayer" , "Extremist" , "as agreed!" , "So let it be" , "Prayerful last word" .)

I've seen this clue in The Sun.
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