Cake:

1. Combine cake mix, pudding mix, Smith's sour cream, vegetable oil, Smith's milk, eggs and the zest and juice of 2 clementines on low speed for 30 seconds.
2. Scrape down the sides of the bowl, then beat on medium speed for 2 minutes.
3. Grease and flour two 9" round cake pans. Divide batter evenly and bake for 350 F for 29-33 minutes.
4. Cool cakes completely on a wire rack.

Simple Syrup:

1. While the cake is baking, combine water, sugar and the juice and zest of 4 clementines in a small sauce pan and heat until sugars is dissolved.
2. Remove from heat and cool completely.

Frosting:

1. Stir together the Smith's sour cream, brown sugar, whipped topping, cinnamon and clementine zest.

To Assemble:

1. Cut each cakes evenly into two layers.
2. Place one layer on a platter, brush or drizzle with simple syrup and spread with1/4 of the frosting.
3. Repeat for all layers and garnish as desired.