Daughter of Agamemnon and Clytemnestra in Greek mythology after whom a psychological complex is named (7)
I believe the answer is:
electra
(Other definitions for electra that I've seen before include "complex character" , "Tragic daughter of Agamemnon" , "legendary Greek daughter" , "Daughter of Agamemnon and Clytemnestra (who has a complex?)" , "Greek heroine (with a complex!)" .)