Porgy and bass (4)
I believe the answer is:
fish
'porgy and bass' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for fish that I've seen before include "Aquatic animal(s)" , "counter in various games" , "Customer" , "To try to catch" , "Aquatic creature; rail-joining plate" .)