The crossword solution for the term 'geniuses, informally' is 'smarties' (8 letters). Smarties are a type of candy produced by Nestle. They are small, round, and come in a variety of colors and flavors. The candy has been around since 1937 and is popular in many countries around the world. The term 'smarties' is often used as a slang term to refer to people who are exceptionally intelligent or talented.