The one-legged captain makes a habit of it (4)

I believe the answer is:

ahab

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'the one-legged captain' is the definition.
'Ahab' can be an answer for 'captain' (Captain Ahab appears in Moby-Dick). I'm not certain of the 'the one-legged' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for ahab that I've seen before include "Melville's whale chaser" , "Fictional whaler" , "sea captain" , "Jezebel's husband - Moby Dick's hunter" , "Israelite king" .)

I've seen this clue in the Evening Standard.

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