Take the 'A' Train is a jazz standard composed by Duke Ellington in 1939. The term is also used to refer to the A train, a rapid transit service in New York City that runs from Inwood in Upper Manhattan to Far Rockaway in Queens. The answer to the crossword puzzle is 'RIDE', which is a four-letter word. Therefore, the complete sentence would be: The term 'Take the 'A' Train' refers to the A train rapid transit service in New York City and the answer to the crossword puzzle for this term is 'RIDE'.