Evangelist may thus encourage a kids' textbook (9)

I believe the answer is:

gospeller

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'evangelist' is the definition.
(I know that evangelist can be written as gospeller)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gospeller that I've seen before include "Evangelist" , "evangelical preacher" , "Bible reader" , "religious type" , "zealous preacher" .)

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

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