The crossword solution for the term 'Daffy Duck Feature' is 'Lisp'. Lisp is a programming language that was created in 1958 and has been used in many applications since then. It is a high-level language, meaning it is designed to be easier to read and write than other programming languages. Lisp is often used for artificial intelligence applications, such as natural language processing and robotics. It is also used in web development, game development, and data analysis.