Possible Clues:

• Tricky puzzle
• It might be difficult to get this artisan beer to ferment
• Bar trainees could become such a dilemma
• *Tricky puzzle
• It may call for lateral thinking
• Puzzle sane arbiter's sorted out
• Water fills empty butt, as always getting round problem
• New artisan beer is a puzzle
• Brewing artisan beer is a difficult exercise
• Problem brewing artisan beer