The crossword solution for the term 'CALL'S PARTNER' is BECK, which is a four letter word. BECK is a surname of English origin, and is derived from the Old English word for stream or brook. It is also a popular given name, often used as a shortened form of the name Rebecca. In this context, it is likely referring to the American musician BECK Hansen, who is best known for his musical partnership with the artist and producer Pharrell Williams.