The answer to the crossword for the term 'ANTHEM COMPOSER' is KEY, which is a three letter word. The term 'ANTHEM COMPOSER' refers to a person who composes anthems, which are songs that are used to represent a nation, state, or other group. These compositions often have lyrics that express the values and beliefs of the group they represent. Famous examples of anthem composers include Ludwig van Beethoven, who composed the German national anthem, and Francis Scott KEY, who wrote the United States' national anthem.