Possible Clues:

• One gets into the crust of this to make it all so fruity
• Type of fruit with leathery aromatic rinds
• Orange genus
• Orange tree genus
• Cut the lemon, sir. That may be the answer
• Orange or lemon tree, perhaps
• Like oranges and tangerines
• Fruit from orange or lemon tree
• Describing lemons, for example
• Is there one in the crust? The answer's a lemon