Bring 4 cups water to a boil in a 4-qt. saucepan over medium-high heat. Add tea bags; boil 2 minutes. Remove pan from heat; add clementine juice and sliced clementines. Let steep 10 minutes. Discard tea bags and clementine slices. Stir in sugar until dissolved. Pour into a 1-gal. container, and add 5 1/2 cups cold water. Serve over ice.
Note: We tested with Lipton Iced Tea Family Size Tea Bags.