The term 'stable stock' refers to a type of stock that is not subject to large fluctuations in price. This type of stock is often sought after by investors who are looking for a more reliable and consistent return on their investments. The crossword solution for this term is 'BRIDLES', which refers to the straps or harnesses used to control a horse. BRIDLES are typically made from leather and metal, and they are used to help the rider control the horse's movements.