Possible Clues:

• Fiery, like Harry and Henry?
• Impetuous, and what 16-, 23-, 34- and 48-Across are, initially
• Had editor describing old article as rash
• Love article mostly penned by chief editor, impetuous
• Having fever symptoms and rash?
• Impulsive, as Harry and Helen are seen to be?
• Had editor describing old article as reckless
• Having a high temperature preceded rash