Answer: clerestory

AnswerCrossword Clue
CLERESTORYGallery
CLERESTORYHigh-window section of a structure
clerestorythe upper storey of a church; windows near the roof of a building also CLEARSTORY
clerestoryraised construction, as on the roof of a railroad car, having windows or slits for admitting light or air
clerestoryportion of an interior rising above adjacent rooftops and having windows admitting daylight to the interior