Possible Clues:

• Spanish port
• City in Spain's Basque Country
• Spanish city, home to the Guggenheim Museum
• It sounds as if William might be inclined to be respectful in Spain
• William heard old seaman's back in port
• Tolkien character touring a Spanish town
• Spanish Basque port
• Basque capital's pounds are in lifetime account
• Guggenheim locale
• Left graduate to go into account of life in European city