Promoter of gospel by faceless Apostle (8)

I believe the answer is:

marketer

I'm a little stuck... Click here to teach me more about this clue!

'promoter' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I don't see?

'of gospel by faceless apostle' is the wordplay.
'of gospel' becomes 'mark' (I am not sure about this - if you are sure you should believe this answer much more).
'by' says to put letters next to each other.
'faceless' means to remove the first letter.
'apostle' becomes 'Peter' (Peter is an example).
'peter' with its first letter taken away is 'eter'.
'mark'+'eter'='MARKETER'

Can you help me to learn more?

(Another definition for marketer that I've seen is " One selling something".)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.