Possible Clues:

• As tragedian you read out letters on grave and murderous date
• Playwright's constant regret over date in Rome
• With pride I sue obscene playwright
• Prizewinning dramatist eventually made a dogs' dinner
• Greek dramatist, author of 'Medea'
• … some of which I spied, disguised as exponent of 11 28
• Priedieus specially set out for playwright
• Greek dramatist I repeatedly perused in translation
• Dramatist showing wishful remark from UKIP on fateful day
• Play-maker, current in Peru side, taken out