Possible Clues:

• Fiery man having retired has gone mad
• Survivor of fire retired, say, in denial
• Been a god? Unlikely biblical character
• Retired, I secured name as firewalker
• Retired and gone daft, he was fireproof!
• Old furnaceman retired and somehow gone
• The Gentleman was not for burning
• One of Daniel's companions who was saved from the furnace
• Ex-fireman's retired and gone travelling
• Keeping hospital place, a conscious person who was protected from fire