Related Clues:

• Unhelpful answer
• 'How should I know?'
• "No idea"
• 'Haven't the foggiest'
• [Shrug]
• "I dunno"
• Words said with a shrug
• "Not a clue!"
• 'I dunno'
• George Bernard Shaw play
• "No clue"
• ''Beats me''
• 'No clue!'
• It's unpredictable, but don't ever say so
• Uncertain consequences of joining MI5?