Soldier's routine (7)
I believe the answer is:
regular
I believe this clue is a double definition.
'soldier's' is the first definition.
(member of the regular army)
'routine' is the second definition.
('regular' can be similar in meaning to 'routine')
(Other definitions for regular that I've seen before include "Recurring at short uniform intervals" , "At set intervals" , "orderly" , "Perishes" , "Symmetrically arranged" .)