The term 'Anthem Writer' can be solved by two crossword solutions: Mickey (6 letters) and KEY (3 letters). Mickey is a reference to the American composer and lyricist, Mickey Newbury, who wrote the song 'An American Trilogy' which has been used as an unofficial anthem for the United States. KEY is a reference to Francis Scott KEY, the author of the United States' national anthem, 'The Star-Spangled Banner'.