Response from key people (4)
I believe the answer is:
amen
'response' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'key people' is the wordplay.
'key' becomes 'a' (I can't explain this - if you can you should believe this answer much more).
'people' becomes 'men' (men are people).
'a'+'men'='AMEN'
'from' is the link.
Can you help me to learn more?
(Other definitions for amen that I've seen before include "as agreed!" , "statement of affirmation" , "Churchgoer's assent?" , "Word of approval" , "prayer's ending" .)