A dancer was an individual who danced professionally.
Lola Montez was a 19th century dancer known for her Spider Dance and for her string of liaisons across Europe. (PROSE: Whiskey and Water)
Baano was a dancer brought aboard an artificial planetoid for a temporal conference. (AUDIO: Square One)
Laliaargh and Durrrin were Shivashian dancers that took part in the Universal Dance/Off (nine million and two) at the Cosmos Ballroom. (COMIC: Death Disco)
Ernestina Stott was a professional dancer, also known as "the Nutcracker". The Fourth Doctor first met her while she was possessed by Hornets. (AUDIO: The Dead Shoes)