A porridge (6,4)
I believe the answer is:
rolled oats
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a porridge</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 rolled oats that I've seen before include "breakfast cereal" , "porridge" .)