The term 'East or West Ender' refers to a person who lives in either the East End or the West End of London. The crossword solution for this term is ERN, which stands for East or North. This indicates that the person lives in either the East End or the North End of London. The East End is traditionally known as the poorer and more working-class area of London, while the West End is known for its affluent and fashionable neighborhoods.