Possible Clues:

• Frank --, English boxer
• Old pugilist from Britain and a figure from Spain
• Name that anagrams to "rub on"
• Ostracized uncle in 'Encanto'
• "Encanto" character
• Uncle 'we don't talk about' in Disney's 2021 film 'Encanto'
• Mars on Earth
• 41-Down singer Mars
• Mars who sang "Please Me" with Cardi B
• Saskatchewan town