Done on a large scale (4)
I believe the answer is:
mass
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">done on a large scale</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 mass that I've seen before include "Roman Catholic service" , "load" , "Heap; religious service" , "state, briefly" , "Church service - collection" .)