Taking everything into account — nothing kept secret (3,4)
I believe the answer is:
all told
'taking everything into account' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for all told that I've seen before include "Taking everything into account" , "Taking every one into account" , "Altogether" , "In summary" , "To summarise" .)