Maniacal Melville mariner (4)

I believe the answer is:

ahab

(Other definitions for ahab that I've seen before include "sea captain" , "Captain -, pursuer of Moby Dick" , "Captain hunting the whale Moby-Dick" , "Moby Dick's pursuer" , "Husband of Jezebel" .)

I've seen this clue in the Universal.

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