In a 4- to 6-quart slow cooker, add the onion, celery, garlic, butter, sea salt, and black pepper. Pour the chicken broth over the vegetables. Cover and cook on
LOW for 1 hour or until the vegetables are fork tender.
Add the clams, clam juice, 5 oz of the bacon, cream cheese, heavy cream, and rosemary. Stir well to combine.
Cover and cook on LOW for 6 hours.
Serve sprinkled with the remaining 1-ounce crumbled bacon.