"You can say that again!" (4)

I think it could be either:

Which length description are you looking for?:

amen

'you can say that again' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for amen that I've seen before include "Extremist" , "Prayerful last word" , "Final word in prayer" , "Conclusion of prayer" , "Word of agreement" .)

I've seen this clue in the LA Times, The New York Times, the Universal and the USA Today.

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