Fish from Marillion's penultimate album's out (3)
I believe the answer is:
cod
'fish' is the definition.
(type of fish)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for cod that I've seen before include "One caught in the deep maybe" , "A white fish" , "North Atlantic fish" , "Common food fish" , "Pay when you get the goods - sounds fishy" .)