The term 'BEATNIK'S 'GET IT?'' can be solved by the three letter word 'DIG'. Beatniks were a group of people in the 1950s and 1960s who rejected mainstream culture and embraced a more artistic lifestyle. They were known for their use of slang, and 'get it?' was a phrase they often used to indicate that someone had understood what they were saying. Therefore, the crossword solution 'DIG' is an appropriate answer to the term 'BEATNIK'S 'GET IT?'', as it implies that the speaker has been understood.