Dish of leftovers (6,3,6)
I believe the answer is:
bubble and squeak
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dish of leftovers</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bubble and squeak that I've seen before include "food" , "Dish of leftovers" , "breakfast?" , "course" .)