Crossword Genius

Capital of Ghana losing exterior bits (5)

Ross

I believe the answer is:

hanoi

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'capital' is the definition.
(capital of Vietnam)

I cannot understand how the remainder of the clue works.

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

I've seen this clue in The Independent.
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