Character with an ivory leg (4)
I believe the answer is:
ahab
'character with an ivory leg' 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 "One whose nemesis was white" , "Melville's whale chaser" , "Captain of the whaler Pequod" , "one who hunted whales" , "Name of captain seeking Moby Dick" .)