Foreign capital used by Napoleon from a very early age (7)

I believe the answer is:

ajaccio

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'foreign capital' is the definition.
'ajaccio' can be an answer for 'capital' (I have seen 'Capital of Corsica' mean 'ajaccio' so perhaps 'capital' could also mean 'ajaccio'). I am not certain of the 'foreign' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ajaccio that I've seen before include "town on the Med" , "Corsican city" , "island port" , "Corsican town, Napoleon's birthplace" , "Corsican capital" .)

I've seen this clue in The Globe and Mail.

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