Possible Clues:

• Burn to warble on one note
• Only one not left with superficial injury
• Burn up, say, overcome by wrath, perhaps?
• Char one has left out
• Lightly brand
• Char is slightly deficient vocalist
• Burn to intone on a single note
• Sounds as if Byrne might start to do this and be vocal on one note
• Burn for a wicked deed on empty grave
• Blacken