Possible Clues:

• Hold forth
• Girl abandoned opera part, close to return
• Character who gave Theseus the thread to find the way out of the Minotaur's labyrinth
• She came to Theseus' aid
• Operatic heroine's number to finish up
• In Greek mythology, she gave Theseus the thread with which he found his way out of the Minotaur's labyrinth
• Greek princess in song, bottom raised
• Daughter of 48-Across who helped 13-Across
• Woman abandoned by Theseus
• Key figure in a labyrinth escape