Possible Clues:

• What one of the dukes may possess?
• Duchess ultimately visits on and off — it's enough for duke
• Amount of fancy stiff upper lip, for starters
• First awarded to very loud university student -- that's all one can grasp
• 'A -- of Dollars', 1964 film
• A — of Dollars (film)
• Son enthralled by occasional amount of dollars?
• Amount a hand holds
• Dollar amount in a Western?
• A — of Dollars (film)