Into twice, overall (2,4)

I believe the answer is:

in toto

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'overall' is the definition.
(I've seen this before)

'into twice' is the wordplay.
'twice' becomes 'to' (I can't explain this - if you can you should believe this answer much more).
'into'+'to'='IN TOTO'

Can you help me to learn more?

(Other definitions for in toto that I've seen before include "As a whole (Lat.)" , "In entirety" , "As a whole (Latin)" , "overall" , "All told" .)

I've seen this clue in the Sydney Morning Herald.

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