Sentence:  Trekkers, Whovians and <WSD>Ringers</WSD> were out in force over the weekend as sci-fi and fantasy fans descended on Cardiff for the city's Film and Comic Convention. 
Meaning of the word marked with <WSD> tags:  A fan of the novel "(The Lord of the Rings)" by (J. R. R. Tolkien) and/or the film trilogy based on it.