As a detective tasked with solving the mystery of the crossword clue, “Longtime anchor of ‘NBC Nightly News’,” my mind immediately jumps to the familiar faces that have graced the screen in the past. Names like Tom Brokaw, Brian Williams, and Lester Holt come to mind. However, the use of the word ‘longtime’ makes me believe that the answer has to be someone who held the position for a significant amount of time. Further research into each anchor’s tenure confirms that Tom Brokaw served as the anchor for NBC Nightly News the longest, from 1982 to 2004. With this insight, I confidently fill in the answer to the crossword clue as ‘BROKAW,’ feeling satisfied with my investigation and problem-solving skills.