Population informed in total (3-4)

I believe the answer is:

all-told

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

'population informed' is the wordplay.
'population' becomes 'all' (I am not sure about this - if you are sure you should believe this answer much more).
'informed' becomes 'told' (telling is a kind of informing).
'all'+'told'='ALL-TOLD'

Can you help me to learn more?

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

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