The most common and most likely answer to this crossword clue is the 8 letter word PSALMIST
I've seen this crossword clue in The Guardian
P
S
A
L
M
I
S
T
More clues leading to the result PSALMIST
- Source of prophecy enthrals second writer of religious texts
- Possibly last page is introduction to Michelangelo’s David?
- Posh occasionally: ‘I’m last to perform for David?‘
- Songwriter’s son adopted by fortune-teller
- Maybe David‘s a fortune-teller taking piece of silver
- Saint included by diviner religious composer
- David and Sam split change
- Seer welcoming son for poetic king …
- One looking into the future admitting son may become religious writer
- One sings his praises
Buddy explains!

The straight part
We know that "one who praises God" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one who praises god = psalmist.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PSALMIST mean?
PSALMIST noun- A composer of psalms
- (capitalized) A composer of one of the Biblical Psalms