Fussing (3)
I believe the answer is:
ado
'fussing' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ado that I've seen before include "Fuss or bustle" , "Shakespeare: 'Much ... About Nothing'(3) ()" , "Nothing caused much around 1598" , "Goings-on" , "excitement" .)