Fuss yet to be dealt with? (4)
I believe the answer is:
todo
'fuss' is the definition.
(I've seen this in other clues)
'to be dealt with?' is the wordplay.
'be' becomes 'do' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'dealt with?' means one lot of letters go next to another (some letters placed down or dealt alongside others).
'to'+'do'='TODO'
'yet' is the link.
Can you help me to learn more?
(Other definitions for todo that I've seen before include "disturbance" , "List that plans" .)