Ballerina Spessivtseva was a Russian prima ballerina of the early 20th century. Her name is often shortened to Olga Spessivtseva, which is the four letter solution to the crossword. She was known for her grace and agility, which is represented by the five letter solution 'prima' and 'LITHE'. Prima is a term used to describe a principal dancer in ballet, while LITHE is an adjective that means graceful and flexible.