Capital city of Vietnam (5)

I believe the answer is:

hanoi

'capital city of vietnam' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for hanoi that I've seen before include "Vietnamese city" , "capital out East" , "Asian capital on the Red River" , "Asian city" , "foreign city" .)

I've seen this clue in The Times.

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