The term BACKING FOR PLASTERWORK can be solved by the crossword solution LATHS, which is an acronym for 'Laths and Plaster'. Laths are thin strips of wood or metal that are used to create a framework for plasterwork. They are nailed or screwed to the wall and then covered with a layer of plaster. This backing provides a strong and stable base for the plasterwork, allowing it to be applied evenly and securely.