The crossword solution for the term 'working-model' is 'POSER'. A POSER is a person who poses for an artist, photographer, or sculptor. It is also used to describe someone who pretends to be something they are not in order to gain attention or admiration. In the context of a working-model, it refers to someone who models a product or service in order to demonstrate how it works. This type of modeling is often used in marketing and advertising campaigns.