Mulled wine is a perfect drink for the holidays, but be careful how you say "mulled wine." When I told my friends about the mulled wine I was making, invariably they would hear "mold wine" and get grossed out.
Open the wine and dump it in the crockpot (use a 6 quart or larger crockpot).
Pour in the orange juice.
Stir in the sugar, and add the ground spices.
Float the cinnamon sticks and whole cloves on top.
Slice the clementines into rings, and float the rings on top.
Cover and cook on high for 2 hours, or on low for 4. You can continue to cook on low for much longer than that and it keeps getting better. We had some in the evening and then left it on low overnight and had some more the next day.