The term 'GET SMART SECURITY DEVICE' can be summarized by the crossword solution 'CONE'. A CONE is a three-dimensional geometric shape with a circular base and a pointed apex. It is often used as a security device, such as in traffic cones to block off roads or areas, or in sports to mark boundaries. In the context of security, cones can also be used to create physical barriers or to direct people away from certain areas.