Arrange by command (5)
I believe the answer is:
order
This clue is a double definition.
'arrange' is the first definition.
(ordering is a kind of arranging)
'command' is the second definition.
(order is a kind of command)
'by' is the link.
(Other definitions for order that I've seen before include "One may be tall if demanding" , "Rank" , "One of Great Lakes" , "Direction; class; arrange" , "architectural style" .)