From Longman Dictionary of Contemporary Englishwine/film/opera etc buffwine/film/opera etc buffKNOW somethingsomeone who is interested in wine, films etc and knows a lot about them► see thesaurus at expert → buff
Examples from the Corpus
wine/film/opera etc buff• Inside, bartenders wearing leather harnesses serve beer in cans to an assortment of brutes, heathens, and opera buffs.• Alas, even the most well-meaning opera buffs have an unfortunate habit of making their favorite indoor sport sound impossibly complicated.• For the real film buff, however, the place to be has to be BlackStar.• It all started when wine buff Liz entered another competition in the Express.• Rubbish, I hear all you wine buffs out there say. 