The crossword solutions for the term CURTAIN AUTHOR indicate that the job description is END, which is a three letter word. The curtain author is responsible for writing the script for a play or musical, including the dialogue and stage directions. They also create the story and characters, and develop the plot. The curtain author must ensure that the story is engaging and entertaining, and that the dialogue is appropriate for the characters and the setting. The curtain author must also collaborate with other members of the production team, such as the director, actors, and designers, to ensure that the play or musical is successful.