Possible Clues:

• Sift through puzzle
• "What gets wetter as it dries?" is one
• Sift something difficult to understand
• Fill in puzzle
• Puzzle, cooker not opening
• Sift through possible material for a children's book
• Puzzle of theologian enveloped in anger
• 'You break it by saying its name,' e.g.
• Puzzle for disheartened daredevil in fairground attraction
• Pervade conundrum