"Busy" one (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">busy one</span>' is the definition.<br/ ><span class="explanation-format__explanation">(proverbially busy insect)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bee that I've seen before include "In one's bonnet, it's a persistent idea" , "queen, perhaps" , "Social gathering" , "Hive insect" , "Honey-making insect" .)