Possible Clues:

• Is it a strain to get through this puzzle?
• Supposing, supposing, three men were frozen; two died, how many were left? That's worth solving!
• Coarse sieve
• Brainteaser
• Dukes in anger posing cryptic question
• Poser
• It may have an answer, but it's full of holes
• Certain brainteaser
• A mystery for the big screen
• Stumper