Full of frantic activity (6)
I believe the answer is:
hectic
'full of frantic activity' is the definition.
(I've seen this before)
This is the entire clue.
(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" .)