Melville's obsessed captain (4)
I believe the answer is:
ahab
'melville's obsessed captain' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ahab that I've seen before include "Jezebel was wife of this King of Israel" , "He hunted Moby Dick" , "Jezebel's husband, wicked king in the 'Old testament'" , "Jezebel's husband or captain in 'Moby Dick'" , "Jezebel's husband - Moby Dick's hunter" .)