Related Clues:

• 'Beats me!'
• See 107-Across
• 'Ain't got a clue'
• 'Don't ask me'
• 'Beats me'
• You're unsure if you have it
• 'Haven't a clue'
• 'Got me!'
• 'Haven't a clue!'
• 'I have no idea'
• Shrugger's word
• "Beats me"
• "Don't ask me"
• 'No clue'
• Not the faintest idea