Possible Clues:

• Abstainer's drunk half of beer � that's puzzling
• Brian and Teresa worked out puzzle
• Puzzle is hard? Not entirely occupying brother
• Mind being tormented with this knotty problem?
• Support trainees working out hard problem
• Riddle in which head drinks with the queen
• Support at home again set up without a problem
• Knot
• Riddle
• Puzzling thing, soldiers leaving Essex town when Queen appears