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.
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Question: Category: MR. ROBINSON 
Clue: Walker Smith used this name as a professional boxer

Answer: sugar ray robinson


Question: Category: EMPERORS 
Clue: After becoming emperor of Ethiopia in 1930, he gave the country its first written constitution

Answer: haile selassie


Question: Category: POTPOURRI 
Clue: A decisive victory or change, perhaps made with a "new broom"

Answer:
clean sweep