Possible Clues:

• Producer of music by wartime singer is heard
• It takes a bow
• 600, perhaps, with strings attached
• One usually gets into a scrape holding it?
• Six with nothing and nothing back to fiddle with
• Bowed string instrument
• One highly strung in horrid pub, we may hear
• Five, ten, fifty in this with strings attached
• Smallest of the modern stringed instruments
• 'Nude with --', a Noel Coward play