Obsessed mariner of fiction (4)

I believe the answer is:

ahab

(Other definitions for ahab that I've seen before include "Melville's whale chaser" , "Name of captain seeking Moby Dick" , "Captain hunting the whale Moby-Dick" , "Captain -, pursuer of Moby Dick" , "Whaling Captain" .)

I've seen this clue in The Wall Street Journal.

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