Part of Benedictine order (5)
I believe the answer is:
'order' is the definition.
(I know that order can be written as edict)
'part of benedictine' is the wordplay.
'part of' indicates a hidden word.
'EDICT' is hidden in the letters of 'benedictine'.
(Other definitions for edict that I've seen before include "An official command" , "Legally binding command" , "Official decree" , "Decree by authority" , "Decree, fiat" .)