They may be wild or rolled (4)
I believe the answer is:
oats
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">they may be wild or rolled</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for oats that I've seen before include "Wild ones are sown in youthful excess" , "Hardy cereals eaten by horses" , "A cereal crop" , "Cereal food for horses" , "Edible grass seeds" .)