Possible Clues:

• European principality
• State it is lent, hence restitution is required
• Principality between Austria and Switzerland
• It's between Austria and Switzerland
• Artist touring English principality
• European principality, capital Vaduz
• Tax haven out of order - license it, then
• Land Chinese title after hammering Nanking's No One
• Isn't he in elect group in the country?
• Small European country