The term 'Added Wing' can be broken down into two crossword solutions: ANNEX (5 letters) and ELL (3 letters). An ANNEX is an addition to a building, usually connected to the main structure. It is often used to provide extra space for a growing business or family. An ELL is a wing-shaped extension of a building, typically added to the side or rear of a house. Ells are often used to add extra living space or storage.