Possible Clues:

• Prince entering capital city of ancient Greece
• Detective admits sorting out help in old informant's place?
• Indian city without parking for historic location
• City of ancient Greece with an oracle
• Sanctuary quiet in Asian metropolis
• Detective welcomes help out in place of old Greek informant
• Greek oracle location
• Parking in Asian metropolis for sacred site
• Greek oracle locale
• Ancient sanctuary, peaceful initially in new capital city