I am brought in to identify the fish (6)

I believe the answer is:

plaice

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'fish' is the definition.
(plaice is a kind of fish)

I don't understand how the remainder of the clue works.

(Other definitions for plaice that I've seen before include "The fish sounds as if it hits the spot" , "Large flat fish" , "Location of the fish" , "Brown flatfish" , "A fish; sounds like put" .)

I've seen this clue in the Evening Standard.

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