The first of the major Hebrew prophets (6)
I believe the answer is:
isaiah
'the first of the major hebrew prophets' 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 "Sixty six chapter prophet" , "Book of prophecies in the Bible" , "After Psalms, the longest book in the Old Testament" , "8th century BC Hebrew prophet" , "Sir - Berlin, twentieth century political historian" .)