The crossword solution for the term 'stirrup setting' is EAR, which stands for Equine Aural Resection. This is a surgical procedure that is performed on horses to remove the EAR canal and surrounding tissue in order to treat chronic EAR infections. The procedure is also known as an aural resection or aural ablation. It is a relatively common procedure and is often used to improve the horse's hearing and reduce the risk of further infection.