Half of these have none in Asian city (5)

I believe the answer is:

hanoi

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

'half of these have none' is the wordplay.
'half of' indicates taking half.
'these have' becomes 'have'.
'none' becomes 'noi' (I can't explain this - if you can you should believe this answer much more).
'have' with half the letters taken is 'ha'.
'ha'+'noi'='HANOI'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for hanoi that I've seen before include "capital out East" , "Asian city" , "Vietnamese city" , "Vietnamese capital" , "Capital city of Vietnam" .)

I've seen this clue in The Irish Times.

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