This can be stated in active form. Alternate translation: "A highway will be there that has the name The Holy Way" (See: [[rc://en/ta/man/translate/figs-activepassive]])
This refers to unclean people. A person who God considers spiritually unacceptable or defiled is spoken of as if the person were physically unclean. Alternate translation: "Those who are unclean" or "People who are not acceptable to God" (See: [[rc://en/ta/man/translate/figs-nominaladj]] and [[rc://en/ta/man/translate/figs-metaphor]])
This is an idiom. Here "walking" refers to "living." This refers to the person who lives a holy life. The full meaning of this statement can be made clear. Alternate translation: "who lives in the holy way" or "who lives a holy life" (See: [[rc://en/ta/man/translate/figs-idiom]] and [[rc://en/ta/man/translate/figs-explicit]])