The last word in armaments! (4)

I believe the answer is:

amen

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

'in armaments' is the wordplay.
'in' says the answer is hidden in the clue.
'AMEN' is hidden within 'armaments'.

(Other definitions for amen that I've seen before include "Prayer ending" , "Last word of prayer" , "So let it be" , "Word of agreement" , "Word at the end of a prayer" .)

I've seen this clue in The Times.

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