Command a group of monks (5)
I believe the answer is:
order
I believe this clue is a double definition.
'command' is the first definition.
(I know that order is a type of command)
'a group of monks' is the second definition.
(I've seen this in another clue)
(Other definitions for order that I've seen before include "Command; sequence" , "Apply for - class" , "Command or written direction" , "Type of column" , "demanding firm discipline" .)