Colonel or major, eg (7)
I believe the answer is:
officer
This clue is a double definition.
'colonel' is the first definition.
(thesaurus)
'major eg' is the second definition.
(major is a kind of officer)
(Other definitions for officer that I've seen before include "Member of police force" , "Commissioned rank" , "Leading soldier" , "eg Colonel" , "Commissioned member of armed forces" .)