Related Clues:

• 'Something wrong?'
• Difficult matter; puzzle
• A question to be solved in math
• Poser is a pain in the neck locally
• Question odd features of ballet during concert
• Puzzle being difficult
• Difficulty for British leaving en masse initially
• Muse endlessly about this, for example
• Source of difficulty
• Difficulty for retiring opera singer to sack alto
• Trouble for bishop with the French maiden
• It's difficult to settle for the Parisian in outskirts of Birmingham
• Difficulty for leaders of BBC Lineker epitomised, maybe
• Snag, hitch