Alvin who was the first prosecutor in American history to win a conviction against a former president (5)

I believe the answer is:

bragg

(Other definitions for bragg that I've seen before include "arty broadcaster" , "Lord Melvyn - -" , "Melvyn -, British author and broadcaster" , "Melvyn --, Billy --" , "Melvin, author" .)

I've seen this clue in The Washington Post.

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