Possible Clues:

• "No clue"
• 'No clue'
• Still confused about a copy of the Iliad? (3,3,5,2,2)
• What you might say upon seeing 17-, 23-, 51- and 62-Across?
• It galls terribly to smell book that I can't grasp (3,3,5,2,2)
• Classic statement of confusion, and a hint about this puzzle
• "I can't figure this out"
• I can't fathom this Athenian attitude to Cyprus
• Bewildered comment
• Totally confused response