Biblical Book of Prophecies (6)
I believe the answer is:
isaiah
'biblical book of prophecies' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for isaiah that I've seen before include "8th century Hebrew prophet and O.T. Book" , "Book of prophecies in the Bible" , "8th century BC Hebrew prophet" , "Biblical Book of Prophecies" , "Major Hebrew prophet and O.T. Book" .)