Crossword Genius

And another thing: change liturgical book (7)

Ross

I believe the answer is:

psalter

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'liturgical book' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for psalter that I've seen before include "Stapler for a book of psalms" , "Book of sacred songs" , "Book of religious songs" , "Liturgical book" , "Book used in church" .)

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