Possible Clues:

• He will have marked cards, of course
• Bettor's buddy
• Gambling advisor
• He gives betting advice
• Call for attention in bank, one to give better advice
• Centre for ski-trips safeguards piste after avalanche one forecasts
• Quiet way, in bank, he recommends risky investments
• Talk initially with unorthodox priest who can give better advice?
• Track tout
• One advising betters