Wife of Theseus (7)
I believe the answer is:
phaedra
'wife of theseus' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for phaedra that I've seen before include "Tragic old Greek" , "Wife of Theseus, subject of a play by Racine" , "Wife of Theseus who fell in love with his son" , "tragedy" .)