Full of frantic activity (6)
I believe the answer is:
hectic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">full of frantic activity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hectic that I've seen before include "Exciting, and confusing perhaps" , "Extremely busy - fevered" , "particularly busy" , "Marked by intense activity" , "Involving feverish activity, chaotic" .)