Possible Clues:

• Grapefruit-like fruit
• Marmalade fruit
• Largest citrus
• Grapefruit taste-alike
• Citrus fruit similar to a grapefruit
• Fruit with which yours truly stuffs game
• Include me in the horseplay for one of the five a day
• Asian citrus fruit
• Grapefruitlike fruit
• Huge Asian grapefruit