The crossword solution for the term 'Isherwood Collaborator' is AUDEN, a five-letter word. The collaborator in question is W.H. Auden, an English poet, playwright, and essayist who was born in 1907 and died in 1973. He was a close friend and collaborator of Christopher Isherwood, an English novelist, playwright, and diarist. Auden and Isherwood worked together on several projects, including the play The Ascent of F6.