She did nothing but found Carthage and partner Aeneas (4)
I believe the answer is:
dido
'she' is the definition.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for dido that I've seen before include "Carthaginian heroine" , "Operatic heroine" , "Ancient queen of Carthage" , "Founding queen of Carthage (did next to nothing!)" , "Antic" .)