Possible Clues:

• Primate in sporting venue, one standing in for duke
• Primate originally lived on rocky island
• Primate, one taking duke's place in MCC headquarters
• Tailless night creature
• Nocturnal Indian primate
• Big-eyed lemur
• Primate, one standing in for duke in upper chamber
• Primate, one replacing duke in cricket ground
• A slow mover, one put into the ground not having died
• Sri Lankan or East Indian lemur