Religious text that's evangelical not wholly uplifting (6)

I believe the answer is:

avesta

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'religious text' is the definition.
(Avesta is an example)

'that's evangelical not wholly uplifting' is the wordplay.
'AVESTA' is hidden back-to-front within the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for avesta that I've seen before include "Zoroastrian scriptures" , "collection of holy writings" , "holy text" , "sacred text" , "holy scriptures" .)

I've seen this clue in The Independent.

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