They might be standing or marching (6)
I believe the answer is:
orders
'they might be standing or marching' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for orders that I've seen before include "Commands the religious ones?" , "Sends away for" , "'Decrees, edicts (6)'" , "Holy - -" , "Commands these priests and nuns?" .)