No, No, Nanette Foursome' is a musical comedy written by Otto Harbach and Oscar Hammerstein II. It was first performed in 1925 and tells the story of a young woman who is caught between two men who are vying for her affections. The crossword solution for the term 'ENS' is 'ENSEMBLE', which refers to a group of performers in a musical or theatrical production. An ENSEMBLE typically consists of actors, singers, dancers, and musicians who work together to create a unified performance.