Big busyness (3)

I believe the answer is:
ado
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">big busyness</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 ado that I've seen before include "Nothing caused much around 1598" , "Fuss or bustle" , "Fuss, difficulty" , "Fuss, bother" , "Shakespeare: 'Much ... About Nothing'(3) ()" .)