That foxy fish? (3)
I believe the answer is:
cod
'fish?' is the definition.
(type of fish)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cod that I've seen before include "Initially, pay when you get the goods" , "A fish; a hoax, parody" , "Cash on delivery (abbr.)" , "Fish noted for liver oil" , "Hoax (sl.); fish" .)