Possible Clues:

• Tomfoolery, e.g
• Beer and skittles
• Amusing
• One-third of a 1964 hit song title
• When tripled, song involving a T-bird
• One-third of a Beach Boys tune
• 'Merriment, playfulness (3)'
• ''Ain't We Got ___?''
• What homework usually isn't
• Disneyland promise