Confer holy orders on (6)
I believe the answer is:
ordain
'confer holy orders on' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ordain that I've seen before include "Elevate or appoint to priesthood" , "Lay down (law)" , "Rule" , "Initiate as priest" , "Make a decree" .)