Flat dish (5)
I believe the answer is:
plate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flat 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 plate that I've seen before include "Item of crockery" , "From which food is eaten or served" , "Cover with metal" , "trophy" , "This glass is thick as for shop window" .)