Related Clues:

• Madman, a mere description from E L Doctorow?
• 'Thou art too low to be their lawful love, and too high to be their unlawful —' (Scott, The Fair Maid of Perth)
• Obsessive mother backed murderous brother
• Diver left without costume?
• The Joker, e.g
• Wailing waterfowl
• Wild, perhaps violent, type
• Diver; silly person
• Person with a craving or enthusiasm for something
• The diver left with nothing on
• Chap one may account a madman...
• A wildly disordered individual can aim to change
• There's a nut in a funny coat outside
• Lunatic chewed up caiman, or vice versa
• Chap confronting 1 Across is a lunatic