Possible Clues:

• Fruit high in Vitamin C
• Channel Islands endlessly rely on fruit
• Clementine or lime, e.g
• Is one in the crust? The answer's a lemon (6)
• Fruit such orange, lemon etc.
• One is in the crust of the lemon
• It is planted in vineyards and it bears fruit
• Fruit type
• Fruit: piece of bread almost sandwiching it
• Fruit like a lemon