Preheat the oven to 350 degrees F. Lay the bacon on a wire rack set over a foil-lined baking sheet; brush the bacon with maple syrup. Bake until crisp, 20 to 25 minutes. Set aside.
Run the lemon wedge around the rims of 6 glasses. Put the celery salt on a plate and dip the rims of the glasses in the salt to coat.
Combine the clam-tomato juice, lemon juice, vodka, horseradish and Worcestershire sauce in a pitcher and stir well. Season with celery salt and pepper. Fill the prepared glasses with ice, then add the cocktail and the maple bacon.