Main part (4)
I believe the answer is:
bulk
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">main part</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 bulk that I've seen before include "Greater part" , "Large mass; roughage" , "Amplitude" , "Great size; main part" , "Mass - large quantity" .)