Some proviso honoured in London (4)

I believe the answer is:

soho

'in london' is the definition.
(area of London)

'some proviso honoured' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'SOHO' can be found hidden inside 'proviso honoured'.

(Other definitions for soho that I've seen before include "Central London night life district" , "capital district" , "Colourful show-biz area of West End London" , "Call a large market for software" , "Parts of London and New York City with the same name" .)

I've seen this clue in The Globe and Mail.

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