Possible Clues:

• Mopes around in English horse-racing venue
• Name with salts or Downs
• Records order that's placed for salts?
• Three-year-olds compete here
• Derby's Downs
• & 5 Purgative medicine
• Racecourse some keep so meticulously
• Record physician's ups and downs here
• British racetrack city
• Racecourse record thus misrepresented at first