The Ten Commandments maybe in sacrament (4,6)
I believe the answer is:
holy orders
'sacrament' is the definition.
(holy orders is a kind of sacrament)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for holy orders that I've seen before include "Novices may take these" , "that minister takes" , "papal bulls" .)