Possible Clues:

• Horse that won the Grand National three times
• Multiple Grand National winner
• Make a killing, backing horse
• Take out retired National winner
• Reverse mantra of 'The Shining'
• Grand National winner
• Backing Aintree winner is murder
• Famous horse Queen's used at opening of Edinburgh tattoo
• Was it up to one to make a killing on the famous horse?
• You'd make a killing if you backed this horse