Confidential — Tommy? (7)
I believe the answer is:
private
I believe this clue is a double definition.
'confidential' is the first definition.
(similar in meaning)
'tommy?' is the second definition.
(informal term for a British soldier)
(Other definitions for private that I've seen before include "Secret - soldier of the lowest rank" , "Lowest rank of enlisted person" , "Rank, concealed" , "Unofficial; military rank" , "Lowly soldier" .)