Preheat oven to 425°F. Prepare a doughnut pan by spraying it with cooking spray.
Melt 2 tablespoons butter and allow to cool. In a large metal bowl, whisk together flour, sugar, baking powder and salt. Make a well in the dry ingredients and pour in the milk, vanilla, eggs, melted butter, Clementine juice and zest. Stir until well-combined. Spoon the batter into the prepared doughnut pan. Bake for 9 to 10 minutes. Let doughnuts rest in pan for 4 to 5 minutes, then remove them from pan and allow to cool on a cooling rack.
For the glaze: While doughnuts are cooling, in a medium size bowl whisk together powdered sugar, Clementine zest, seeds scraped from vanilla bean and milk until combined. Immediately spoon over doughnuts or dip them into glaze and then EAT!