Greek goddess of wisdom (6)
'greek goddess of wisdom' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for athena that I've seen before include "wise but fierce goddess" , "Greek goddess of wisdom etc." , "Greek goddess of a capital city" , "One-time goddess" .)
(Other definitions for athene that I've seen before include "Wise woman" , "Pallas -, Gr. goddess" , "One inclined towards socialism or communism" , "patroness of the arts!" , "Minerva was Roman counterpart of this goddess" .)