Possible Clues:

• 'Sounds like the prints abroad (5,4)'
• *Luxembourg’s monarch Henri, e.g
• Noble old lady died, owing about a thousand
• Title of Luxembourg's leader
• Piano duet oddly entertaining British prince
• Czar's descendant
• Tuscany title
• Luxembourg sovereign relative to two old pence and United Kingdom piece of eight
• Member of ruling class in naked drug orgy!
• European nobleman banging fist on piano