Possible Clues:

• I don't know what suspicious police might do
• Church reciting book
• Examination set on this writer I don't know
• I certainly don't know how "marchese" is translated
• Informal expression meaning I don't know
• 'I have no idea'
• Does this sound like something robber might say when carrying nothing incriminating? I haven't a clue!
• "I have no idea!"
• Don't know location of London Bridge? Head for market close to here
• “I’ve got no idea”