My initial impulse would be to try tweaking a "Spiced Spiked Cider" recipe, preferably one that employs Constant Comment teabags. The one I'm thinking of goes:
5 1/3 cups water
7 Constant Comment Tea bags (or another employing orange and spice flavors)
2/3 cup light brown sugar, packed
3 2/3 cups apple cider
2 cups light rum
5 cinnamon sticks, cut in half
2 Tbs cloves in a sachet
Brew the tea by bringing the water to a boil and steeping the bags for no more than 5 min. Remove the bags. Pour the tea into a crock pot, dissolve the sugar int he tea, then add the cider, rum, and spices. Dilute rum with more tea/cider to taste. Heat on crockpot's high setting until warm, then switch to low. Serve.
I'd probably make a similar strong tea mix with a tea that had orange and spice flavors, then add it to orange juice--probably from a bottle--and maybe 1/2 to 1 cup of fresh-squeezed lemon juice. I personally think Tang has a tangerine taste to it, so I'd likely buy an orange/tangerine blended juice. I'd throw all the stuff together in a large pot on the stove (or a crock pot), add a similar amount of brown sugar to the recipe above and add cinnamon, cloves, and nutmeg to taste. I'd simmer everything together to give the spices time to infuse, then remove from the heat and chill if the drink is to be served cold.
I've not done this myself, so I don't know if the juices would overpower the tea, or make the mixture too thick. I'd probably brew up extra tea to help dilute the drink to taste.