As one avers, great power results (6,6)

I believe the answer is:

united states

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'as one avers great power results' is the definition.
I can't tell whether this definition defines the answer.

'as one avers' is the wordplay.
'as one' becomes 'united' (united as one).
'avers' becomes 'states' (I've seen this in another clue).
'united'+'states'='UNITED STATES'

Can you help me to learn more?

(Other definitions for united states that I've seen before include "Country, capital Washington DC" , "National federation" .)

I've seen this clue in The Irish Independent.

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