Edible flatfish (5,4)

I think it could be either:

lemon sole

dover sole

'edible flatfish' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Times, The Guardian, The Sun and The Telegraph.

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