Holy book (5)
'holy book' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for koran that I've seen before include "Islam's sacred book" , "Islamic holy book" , "Muslim holy book" , "Sacred book of Islam (5)" , "Islamic sacred book" .)
'holy book' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bible that I've seen before include "The Christian or Jewish scriptures" , "Book regarded as the ultimate authority on its subject" , "work that's accepted" , "It contains scriptures" , "Authoritative source" .)