You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: 10-LETTER WORDS 
Clue: (Jimmy of the Clue Crew in Seattle)  Used in "Hamlet", it's the common British term for the vendor I'm buying from
fishmonger

Category: THERE'S A WEIGHT 
Clue: At the Kentucky Derby, the horses' equipment & these can weigh no less than 126 lbs. combined
the weight of the jockey

Category: GRAND OL' OPERA 
Clue: Its 4 musical dramas are "Das Rheingold", "Die Walkure", "Siegfried" & "Gotterdammerung"

"the ring of the nibelung"