Steve Earle, “Guy” Guy Clark was one of Steve Earle’s main mentors— Townes Van Zandt, the other — and Earle has honored the brilliant songwriter, who died in 2016, before. On his previous album, from 2017, Earle wrote a farewell to the master, “Goodbye Michelangelo,” and sang “The Last Gunfighter Ballad” on an extended 2011 Clark tribute record that also …