William Shakespeare play featuring the character Thaisa (8)
I believe the answer is:
pericles
(Other definitions for pericles that I've seen before include "Shakespeare play '......., Prince of Tyre'" , "Shakespearean play" , "Ancient Athenian leader - prince of Tyre" , "Ceps rile up the Athenian who ordered the construction of the Parthenon" , "Athenian 'golden age' leader" .)