Commercially prized flatfish of north European seas (5,4)

I believe the answer is:

lemon sole

(Other definitions for lemon sole that I've seen before include "Another tasty flatfish like lone citrus fruit" , "Lose melon, find kind of plaice" , "Tasty plaice of citrus origin?" , "Flatfish, valued as food" , "Edible flatfish" .)

I've seen this clue in The Times.

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