Payment method for fish (3)
I believe the answer is:
cod
I believe this is a double definition.
'payment method' is the first definition.
(cash on delivery)
'fish' is the second definition.
(type of fish)
'for' acts as a link.
(Other definitions for cod that I've seen before include "A fish; a hoax (slang)" , "Not a real" , "A fish; a hoax, parody" , "Payment arrangement" , "method of payment" .)