Related Clues:

• 'Well, let me think …'
• 'Interesting …'
• ''I'm thinking ...''
• 'I haven't a clue'
• ''Very interesting . . .''
• ''Let me think . . .''
• 'Let me think, ...'
• ''I have no idea!''
• Mulling sound
• "I wonder ..."
• Sound of deliberation
• 'Hell if I know'
• Muse emanation?
• 'I haven't the foggiest!'
• ''I'm stumped!''