Perfectly (4,1,5)
'perfectly' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ideally that I've seen before include "In perfect circumstances" , "Lay idle (anag)" , "in theory" , "In the best of all possible worlds" , "Perfectly; most suitably" .)
'perfectly' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for like a charm that I've seen before include "successfully" , "in swimming style" , "Perfectly, as if by magic (colloq.)" .)
'perfectly' is the definition.
('to a T' or 'to a tee' can mean perfectly)
This is the entire clue.
(Other definitions for to a t that I've seen before include "Exactly right" , "In every detail" , "perfectly well" .)