Ancient tribesman in a brownish uniform (3)
I believe the answer is:
hun
'ancient tribesman' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'in a brownish uniform' is the wordplay.
'in' indicates a hidden word.
'HUN' is hidden in the letters of 'brownish uniform'.
Can you help me to learn more?
(Other definitions for hun that I've seen before include "One of fourth to fifth century invaders of Europe" , "Ancient invader" , "Eg, Attila" , "Barbarian" , "One led by Attila" .)