Mix Dry Ingredients: In a large mixing bowl, whisk together flour, sugar, baking powder, cinnamon, nutmeg, clove, and salt.
Combine Wet Ingredients: In a medium bowl, whisk together milk, eggs, sourdough discard, and vanilla extract. Gradually add the wet ingredients to the dry ingredients, stirring until just combined. Fold in the chopped apples.
Heat Oil: Add 2–3 inches of oil to a cast-iron skillet or dutch oven. Heat over medium heat to 350°F, using a candy thermometer to monitor the temperature.
Fry Fritters: Drop spoonfuls of batter into the hot oil. Fry 2–3 minutes per side until golden brown. Use a slotted spoon to transfer the fritters to a baking sheet lined with paper towels to drain excess oil.
Make the Glaze: In a medium bowl, whisk powdered sugar, cream or milk, vanilla extract, and maple syrup until smooth.
Glaze the Fritters: Dip warm fritters into the maple glaze or drizzle it over them. Place fritters on a wire rack to set the glaze.
Serve and Store: Enjoy immediately or store in an airtight container at room temperature for up to 2 days. Reheat in an oven or air fryer for best results.