The crossword solution for the term 'WELL's Partner' is ALIVE, which is a five-letter word. The term 'WELL's Partner' is a reference to the famous novel 'The Time Machine' by H.G. Wells. In the novel, the protagonist travels to the future and meets a race of creatures called Eloi, who are the descendants of humans. The Eloi live in harmony with the Morlocks, their underground counterparts, and together they form a symbiotic relationship. The term 'WELL's Partner' is a reference to this relationship, as the Eloi and Morlocks are partners in the novel.