Son and I journey inside an Asian city (6)

I believe the answer is:

saigon

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'asian city' is the definition.
(city in Vietnam)

'son and i journey inside an' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'and' means one lot of letters go next to another.
'i journey' becomes 'igo' (I can't explain this - if you can you should give a lot more credence to this answer).
'inside' is an insertion indicator.
'igo' inserted into 'an' is 'aigon'.
's'+'aigon'='SAIGON'

Can you help me to learn more?

(Other definitions for saigon that I've seen before include "Former South Vietnamese capital" , "Former name of Ho Chi Minh City" , "city in Asia" , "Asian city once" , "Musical set in Vietnam war - ''Miss . . . . . .''" .)

I've seen this clue in The Telegraph.

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