I think you'll find it's Diaghilev, S. in the clue because the solution is Dolin, A. His first name was Anton - stage name that is, as he was a Brit whose real name was Patrick Kay. He was well known here in the 30s, 40s and 50s. Doline would be a French spelling of his stage name. He was always known as Anton Dolin in the English-speaking world.