I am in a position to produce fish (6)
I believe the answer is:
plaice
'fish' is the definition.
(I know that plaice is a type of fish)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for plaice that I've seen before include "A fish; sounds like put" , "Brown flatfish" , "Position the fish, we hear" , "A succulent flat-fish" , "Edible flatfish" .)