Vegetable casserole (11)
I believe the answer is:
ratatouille
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vegetable casserole</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ratatouille that I've seen before include "Vegetable stew" , "Stewed vegetable dish" , "Film" , "vegetable casserole" , "cooked vegetables in a dish" .)