Possible Clues:

• Big zero Refreshments song?
• "Popular" band ___ Surf
• Nothing, way down south
• Mexican's zilch
• Typical reply to ''Que pasa?''
• Zapata's zip
• Possible reply to ''Que pasa?''
• Uno menos uno, to Unamuno
• 'Nothin''
• Diddly squat