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 consistency, answers should be in all lower cased letters.
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Question: Category: AROUND THE HOUSE 
Clue: A silent butler is used to collect these during or after a meal

Answer: crumbs


Question: Category: THE GENTLE ART OF RUGBY 
Clue: This position is the last line of defense; in the NFL it's the offensive role of Larry Csonka & Moose Johnston

Answer: the fullback


Question: Category: AUTHORS & THEIR SLEUTHS 
Clue: In this Wilkie Collins novel, Sergeant Cuff searches for the missing title diamond

Answer:
"the moonstone"