Captain Ahab, for example — one lamenting audibly (6)
I believe the answer is:
whaler
This clue might be a double definition.
'captain ahab' is the first definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'one lamenting audibly' is the second definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'for example' is the link.
Can you help me to learn more?
(Other definitions for whaler that I've seen before include "Mammal-hunting boat" , "Occupation of Melville's Captain Ahab" , "The Pequod?" , "Ship hunting large mammals" , "one may go to work at sea" .)