Famed whaler (4)
I believe the answer is:
ahab
'famed whaler' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ahab that I've seen before include "Captain hunting the whale Moby-Dick" , "one who hunted whales" , "Captain hunting Moby Dick" , "Jezebel's husband, wicked king in the 'Old testament'" , "Moby Dick's pursuer" .)