Possible Clues:

• six - nil - Nothing's come up to indicate a fiddle
• String in a string quartet
• There's stringy oil in the French wine.
• Instrument with four strings
• There's five, ten, fifty in this to fiddle with
• What Holmes sometimes got out of case
• Fiven ten and nothing back for 3 down
• Fiddle with the strings on it
• Bjork album
• String quartet member