Fuss uncompleted (2-2)
I believe the answer is:
to-do
'fuss' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for to-do that I've seen before include "Fuss or commotion" , "Flap" , "Kerfuffle" , "Bustle" , "Fuss and bother" .)