Everything considered (2,3)
'everything considered' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for all in all that I've seen before include "As a whole, considering everything" , "Taking everything into consideration" , "Taken as a whole, everything considered" , "in summary" .)
'everything considered' is the definition.
('in all' can mean taking into account everything)
This is all the clue.
(Other definitions for in all that I've seen before include "after considering everything" , "Taking everything into account" , "totally" , "Altogether" , "Completely" .)