Possible Clues:

• Horrible ogre inspired by one of nine
• Horrible to leave note without regrets?
• Multiplied total? Sounds horrible
• Very unpleasant morgues upset English
• So ghastly that one raised a few, by the sound of it
• Caesar's heart found in morgue, horribly macabre
• Horrible regrets encapsulated by maxim, not new
• Sickening
• What's horrible was magnified a bit, say
• Devastating grouse: Orlando is ghastly