Dealt with (7)
'dealt with' is the definition.
('handle' can be a synonym of 'deal with')
This is the entire clue.
(Other definitions for handled that I've seen before include "Touched - held" , "managed" , "Dealt with" , "Coped with" .)
'dealt with' is the definition.
('treat' can be a synonym of 'deal with')
This is the entire clue.
(Other definitions for treated that I've seen before include "Given medical care" , "Nursed" , "taken out" , "Dealt with" , "Applied medication to" .)
(Another definition for seen to that I've seen is " Sorted out".)