On watch in rough Soho district (9)

I believe the answer is:

chinatown

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'soho district' is the definition.
The definition suggests a singular noun which matches the answer.

'on watch in rough' is the wordplay.
'rough' indicates an anagram (a rough or broken ordering of the letters).
'on'+'watch'+'in'='onwatchin'
'onwatchin' with letters rearranged gives 'CHINATOWN'.

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(Other definitions for chinatown that I've seen before include "London area north of Leicester Square" , "Ethnic city quarter" , "area dominated by Asian influences" , "Oriental area of a city" , "where Asians live" .)

I've seen this clue in The Sun.

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