Sweetcorn (5)

I believe the answer is:
maize
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sweetcorn</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 maize that I've seen before include "Something cultivated" , "Plant producing sweetcorn" , "Cereal crop" , "Cereal grass producing corncobs" , "Source of oil" .)