Apostolically, they follow John (4)

I believe the answer is:

acts

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'john' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for acts that I've seen before include "Turns" , "Cast down by deeds" , "New Testament book immediately following the Gospels" , "Biblical book" , "Is effective" .)

I've seen this clue in The Irish Independent.

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