Related Clues:

• Capped nut
• Nut, basically
• It's a real pip
• Oak item
• Sparrow snack
• A favorite at Wimbledon
• Tree fruit
• What Chicken Little mistook for the sky
• Chicken Little's bit of falling sky, actually
• Chicken Little's 'sky'
• Future flower, say
• Squirrel staple
• Peach pit, e.g.
• Bit of bird chow
• Ranking tournament player