Vichyssoise vegetable (4)
I believe the answer is:
leek
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vichyssoise vegetable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for leek that I've seen before include "Vegetable symbol of Wales" , "Eat the vegetable and keel over" , "what Fluellen wore in France?" , "Vegetable emblem of Wales" , "Vegetable related to the onion" .)