Flounder or bass (4)

I believe the answer is:

fish

I believe this clue is a double definition.

'flounder' is the first definition.
(thesaurus)

'bass' is the second definition.
(thesaurus)

(Other definitions for fish that I've seen before include "Aquatic creature; rail-joining plate" , "Eg, sturgeon" , "Aquarium" , "Trawler's catch" , "Weatherman" .)

I've seen this clue in the Penny Press.

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