How Aaron starts to be an incarnation of wisdom (6)
I believe the answer is:
athena
'incarnation of wisdom' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'how aaron starts to be an' is the wordplay.
'how' becomes 'then' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'starts' indicates taking the first letters.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'be an' becomes 'a'.
The first letter of 'aaron' is 'a'.
'then'+'a'='thena'
'thena' after 'a' is 'ATHENA'.
Can you help me to learn more?
(Other definitions for athena that I've seen before include "Greek goddess of wisdom etc." , "Greek goddess of a capital city" , "wise but fierce goddess" , "One-time goddess" .)