Seder prophet (6)
I believe the answer is:
elijah
'seder prophet' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elijah that I've seen before include "Mendelssohn oratorio" , "Old Testament prophet" , "Hebrew prophet in the time of Jezebel" , "Biblical prophet" , "he prophesied" .)