The term 'clever one' can be described by three different crossword solutions: WIT (3 letters), SHARPIE (7 letters), and SMARTCOOKIE (11 letters). WIT is a noun that refers to a person who is amusingly skillful, inventive, or facetious. A SHARPIE is a person who is very intelligent and perceptive. Finally, a SMARTCOOKIE is a person who is very intelligent and has good judgement. All three terms refer to someone who is clever and quick-witted.