Large cooking dish (9)
I believe the answer is:
casserole
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large cooking dish</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 casserole that I've seen before include "Stew; dish" , "Cook slowly" , "Meat dish" , "Slow-cooked dish" , "Make a stew" .)