Crossword Genius

Textbook used by the organist (6)

Ross

I believe the answer is:

manual

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'textbook' is the definition.
(thesaurus)

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(Other definitions for manual that I've seen before include "Work-book" , ""How-to" book" , "Instruction book prepared by hand?" , "Relating to the hands" , "Operated by hand" .)

I've seen this clue in The Irish Independent.
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