Officer in uniform or overall (7)
I believe the answer is:
general
This could be a double definition.
'officer in uniform' is the first definition.
'general' can be an answer for 'officer' (general officer is a kind of officer). I'm unsure of the 'in uniform' bit.
'overall' is the second definition.
(similar in meaning)
'or' is the link.
Can you help me to learn more?
(Other definitions for general that I've seen before include "Opposite of private!" , "Usual; officer" , "Lee perhaps" , "Not specialised, like army chief" , "position" .)