"Loved this and so did our guests. After reading the reviews saying this was too sweet, I decided to get RW Knudsens''Just Cranberries' juice, which is unsweetened. I tasted with every ingredient addition, to make sure the clementine flavor came through. With the intensity of unsweetened cranberry juice, I tried it with only 1/3 cup. That added nice color and the clementine flavor remained. I added the remaining cranberry and it was still great, but masked the clementine a bit more. Regarding the cranberry juice, add to your personal taste, but use unsweetened for that pure flavor.
Another question has been, how much clementine simple syrup should I end up with? I think it depends on the size of your clementines. I used fairly large clementines and simmered closer to 10 minutes. I ended up with almost 2 cups of simple syrup.
This will be one of my regular cocktails!