Possible Clues:

• Concerning ex-Liberal
• Course on religion by old Luther, for one
• Concerning previous person trying to fix things
• Advocate of change
• E.g., Martin Luther King back from service late
• Case of remarkable one-time revolutionary
• On the subject of past crusader, perhaps
• Extremely resolute one-time agent of change
• Luther, for instance, the one working with anagrams perhaps?
• Concerning ex Liberal