Crossword Genius

Old Vlad in the Netherlands climbing? Only it's flat! (5,4)

Ross

I believe the answer is:

lemon sole

'it's flat' is the definition.
(sole is a flatfish)

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

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

I've seen this clue in The Guardian.
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