Possible Clues:

• Greek tragedian
• Greek dramatist
• Greek dramatist gives European Union grave message before fateful day in Rome
• Famed Greek in Brussels irrational, taking travels round
• English Geller spied disguised as dramatist
• Could be super idea, one for a Greek dramatist
• Greek writer I repeatedly perused, in translation
• Heavy weight on certain footing, borne by Cadfael
• Classical playwright (Alcestis, Electra, etc)
• Mourning became his complexed heroine