Possible Clues:

• Steamy row disturbed boy in book
• Clemens' private eye?
• Someone playing to pen male whose teeth cut as adventurer
• Turkey was back this year missing a friend of Huck
• You were spotted by eavesdropper, we hear -- lad seeking adventure
• We may sort out Finn's friend
• Adventurous boy most weary after break
• Endlessly grave woodcutter, a resident of St Petersburg
• Mark Twain's adventurous boy