Fish to be paid for when brought (3)
I believe the answer is:
cod
'fish' is the definition.
(type of fish)
I cannot 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 "Pay when you get the goods - sounds fishy" , "Tasty fish or slangy nonsense" , "A white fish" , "Cash on delivery (abbr.)" , "One caught in the deep maybe" .)