Common army officer (7)
I believe the answer is:
general
I believe this is a double definition.
'common' is the first definition.
(I know that common can be written as general)
'army officer' is the second definition.
(type of army officer)
(Other definitions for general that I've seen before include "Non-specialist - army officer" , "Usual; officer" , "Enlarge (anag.)" , "Senior military officer" , "The senior officer is common and widespread" .)