Related Clues:

• Difficulty, poser
• Puzzler
• Puzzle for the scary one to write up
• Matter to be solved
• Matter hard to cope with
• Difficulty to be solved
• Puzzle — difficulty
• Difficulty (these days, of any kind)
• "Volunteers?"
• 'Who wants to volunteer?'
• One requiring solution
• Shortly, exploratory spacecraft meets another in difficulty
• One hard to understand, solve
• Difficulty finds British and the French involved in concert
• A matter hard to solve