City mob is somehow producing mutual advantage (9)

I believe the answer is:

symbiotic

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'producing mutual advantage' is the definition.
I can't tell whether this definition defines the answer.

'city mob is somehow' is the wordplay.
'somehow' indicates an anagram.
'city'+'mob'+'is'='citymobis'
'citymobis' is an anagram of 'SYMBIOTIC'.

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(Another definition for symbiotic that I've seen is " Mutually beneficial".)

I've seen this clue in The Times.

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