The term 'Prompt Actors' refers to actors who are able to quickly learn and deliver their lines without any mistakes. They are often used in theatre, film, and television productions, as they can quickly memorize and deliver their lines without any errors. Prompt actors are highly sought after in the entertainment industry, as they are able to save time and money for production companies. The crossword solution for this term is 'CUE', which refers to the signal given to an actor to begin their lines.