Age of American figure finally raised (3)

I believe the answer is:

eon

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'age' is the definition.
(I know that eon is a type of age)

'american figure finally raised' is the wordplay.
'american' becomes 'no' (I can't justify this - if you can you should believe this answer much more).
'finally' suggests the final letters.
'raised' is a reversal indicator (going up in a down clue).
The final letter of 'figure' is 'e'.
'no'+'e'='noe'
'noe' reversed gives 'EON'.

'of' is the link.

Can you help me to learn more?

(Other definitions for eon that I've seen before include "Vast age; eternity" , "Vast age (alt. sp.)" , "Very long period (US and technical spelling)" , "billion years" , "Era" .)

I've seen this clue in The Guardian.

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