The last word in devotion? (4)

I believe the answer is:

amen

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

I can't explain the rest of the clue.

(Other definitions for amen that I've seen before include "Religiously 11 [THE LASTWORD]" , "Extremist" , "Name for prayer's end" , "Response to prayer" , "Churchgoer's assent?" .)

I've seen this clue in the Evening Standard.

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