A Native American image (7)
I believe the answer is:
persona
'image' is the definition.
('persona' can be a synonym of 'image')
'a native american' is the wordplay.
'a native' becomes 'person' (I am not sure about this - if you are sure you should believe this answer much more).
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'person'+'a'='PERSONA'
Can you help me to learn more?
(Other definitions for persona that I've seen before include "Public image" , "One who is diplomatically acceptable" , "character on the stage?" , "One's outward character" , "Role adopted by actor" .)