Cram; material (5)
I believe the answer is:
stuff
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">cram</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that stuff is a type of cram)</span><br/ ><br/ >'<span class="explanation-format__original">material</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that material can be written as stuff)</span><br/ ><br/ ></span>
(Other definitions for stuff that I've seen before include "Material; eat lots" , "Fill completely" , "facts" , "Material; fill full" , "Miscellaneous objects" .)