Biblical monster (8)
I believe the answer is:
behemoth
'biblical monster' is the definition.
(monster mentioned in the Book of Job)
This is all the clue.
(Other definitions for behemoth that I've seen before include "Monstrous beast, or thing" , "Something abnormally large and powerful" , "Huge or monstrous person or thing" , "Huge organisation" , "Great beast of the Bible" .)