Simpsons creator Groening (4)
I believe the answer is:
matt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">simpsons creator groening</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for matt that I've seen before include "Dull uniform finish" , "book" , "(Of surface) dull" , "gospel!" , "- Lucas (Little Britain)" .)