High priest in Exodus (5)
I believe the answer is:
aaron
'high priest in exodus' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aaron that I've seen before include "high priest" , "Brother of Moses, led the Jews to the Promised Land" , "leader's brother" , "Brother of Moses and traditional founder of Jewish priesthood" , "Brother of Moses who founded the Jewish priesthood" .)