The most common and most likely answer to this crossword clue is the 6 letter word PSALMS
I've seen this crossword clue in The Guardian
P
S
A
L
M
S
More clues leading to the result PSALMS
- Part of hands holding small book
- Note added on charitable gifts in holy book
- Holy book addendum banishing the question of doubts
- Devotional songs sung by priest and son getting donations for the needy
- Friend with script containing special songs
- Final word on charity book
- No substance in pious charity songs like Millennium Prayer?
- Note charity book
- Small change to charity creating sacred music
- Hands round singular songs
Buddy explains!

The straight part
We know that "sacred music" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sacred music = psalms.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 PSALMS mean?
PSALMS noun- A sacred song; a poetical composition for use in the praise or worship of God.
- One of the hymns by David and others, collected into one book of the Old Testament, or a modern metrical version of such a hymn for public worship.