Big fuss (3)
'big fuss' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ado that I've seen before include "puff ball!" , "Fuss, trouble" , "'Much ... About Nothing, Shakespeare play (3)'" , "Hoo-ha" , "Song and dance" .)
(Other definitions for todo that I've seen before include "List that plans" , "disturbance" .)
(Other definitions for hoopla that I've seen before include "fuss" , "Fairground game; great excitement" , "Fair game" , "Ring-throwing game" , "Fairground throwing game" .)