Crossword Genius

A complex plot's beginning to engross Peter perhaps (7)

Ross

I believe the answer is:

apostle

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'peter perhaps' is the definition.
(peter is a kind of Apostle)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for apostle that I've seen before include "Divine messenger" , "Holy person" , "Peter, perhaps" , "Disciple of Jesus Christ" , "Ale pots (anag)" .)

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