Related Clues:

• Hundred and one on back of water tank
• Whence water's drawn back, south of Sark etc
• Part of toilet cold on one's rear
• Toilet water reservoir
• This is in loo, cold one, hard
• Tank -- it's newly installed in European laboratory
• Water storer
• Clip oddly put on rear tank
• Revolutionary in charge with tough-looking tank
• Research facility in Switzerland retains first reservoir
• One small seabird beside cold reservoir
• British islands forbidding reservoir