The crossword solution for the term 'FIX UP, AS PROSE' is EDIT, which is a four-letter word. Editing is the process of revising and improving a piece of writing, such as a book, article, or essay. It involves making changes to the content, structure, grammar, and style of the text in order to make it more effective and accurate. Editing can also involve adding new information or deleting unnecessary information. Editing is an important part of the writing process, as it helps to ensure that the final product is of the highest quality.