Fish for one in a particular locality (6)

I believe the answer is:

plaice

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'fish' is the definition.
(I know that plaice is a type of fish)

I don't understand the rest of the clue.

(Other definitions for plaice that I've seen before include "Large flat fish" , "Tasty flatfish I place here" , "Flat fare" , "N. Atlantic flatfish" , "Large flatfish" .)

I've seen this clue in The Irish News.

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