Possible Clues:

• Outwit by underhand means
• Suborn
• Suborn (people) — tamper with (horses)
• A favourite way to fix the race
• Corruptly influence
• No king goes to the French to drug the horse
• Interfere with person who's entitled to hold key
• Tamper with what's good in nice review by legal type from Spain
• Steal gold coin bishop preserved
• Get at person entitled to entertain bishop