Possible Clues:

• Stringed instrument with a deep round back
• Instrument that makes money for the listener
• Instrument similar to the oud
• One instrument having topped another
• Mandolin forerunner
• Mandolin’s relative
• One with a neck and a round body
• String instrument spelled by removing the first letter from a woodwind instrument
• Gentileschi's 'Self-Portrait as a __ Player'
• It becomes another instrument when "F" is added