Elaborate cake (6)
I believe the answer is:
gateau
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">elaborate cake</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 gateau that I've seen before include "Gooey cake" , "Elaborate cake" , "Richly decorated cake" , "(French?) cake" , "Cake for Pierre" .)