Someone wearing uniform and an overall (7)
I believe the answer is:
general
'overall' is the definition.
(similar in meaning)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for general that I've seen before include "Not specialised or limited" , "Not partial, local or particular like army chief" , "Common - soldier" , "Not specialised, like army chief" , "blanket" .)