Possible Clues:

• 'Girl Genius' protagonist
• Hercule creator Christie
• — Christie, crime writer
• She gives expression of surprise about label being back to front
• Christie who wrote 'Ten Little Indians'
• Aunt of Wooster
• 'Hallowe'en Party' writer Christie
• A biblical city seen by a Wodehouse aunt
• —, Christie, novelist
• and 16: A charge that is 'fabricated', I admitted (11)