The crossword solution for the term 'Zola Best Seller' is NANA, a four-letter word. NANA is a novel by French author Émile Zola, first published in 1880. It is one of Zola's most famous works and is considered a landmark work of naturalism in literature. The novel follows the life of NANA Coupeau, a young woman who rises from poverty to become a successful courtesan in Paris. It is a best-seller and has been adapted into several films and plays.