Reported officer of the army (7)
I believe the answer is:
martial
'the army' is the definition.
'reported officer' is the wordplay.
'reported' shows a homophone (sound like).
'officer' becomes 'marshal' (I've seen this before).
'marshal' sounds like 'MARTIAL'.
'of' is the link.
(Other definitions for martial that I've seen before include "associated with arts and law" , "Warlike; Roman poet" , "Relating to hostilities" , "satiricist" , "Soldierly (arts?)" .)