Possible Clues:

• ''Perry Mason'' star Raymond
• Former US vice-president — dialect way of pronouncing R
• Accent that tends to stick?
• Aaron in a duel
• Veep who had a famous duel
• Prickly seed case that clings to clothing
• A Scot has one
• Jefferson vice president
• You may say it sounds in Offaly and stick to it
• ''Perry Mason'' star