Sentence:  Sherwin Sloan retired early as an ophthalmologist to pursue an obsession that bestowed another title — leader of the "<WSD>Ringheads</WSD>," a nickname for fans of Richard Wagner's four-opera cycle known as "The Ring." 
Meaning of the word marked with <WSD> tags:  A fan of the opera cycle "(Der Ring des Nibelungen)" by (Richard Wagner).