The term 'CLARK'S PARTNER' can be solved by two crossword solutions: 'LEWIS' (5 letters) and 'LOIS' (4 letters). Lewis is the surname of the fictional character Dr. Watson, who is the partner and friend of the famous detective Sherlock Holmes in the Arthur Conan Doyle stories. Lois is the first name of the fictional character Lois Lane, who is the love interest and partner of the superhero Clark Kent, also known as Superman.