Possible Clues:

• Ambitious type very fetching?
• Determined person
• Type-A type
• Famous philanthropist almost taken in by regular visitor's success story
• Giant character decapitated ambitious type
• Self-motivated sort
• Pistol
• One advancing rapidly
• Wodehouse character, not the errand boy or fetch 'n carry man he sounds?
• High-flier eagerly heading off, always takes in race meeting