Vulgar business, tucking into stewed rodent in old part of Turkey (9)

I believe the answer is:

trebizond

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'old part of turkey' is the definition.
The definition suggests a singular noun which matches the answer.

'vulgar business tucking into stewed rodent' is the wordplay.
'vulgar business' becomes 'biz' (informal term for 'business').
'tucking into' is an insertion indicator.
'stewed' is an anagram indicator.
'rodent' with letters rearranged gives 'treond'.
'biz' placed within 'treond' is 'TREBIZOND'.

'in' is the link.

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(Another definition for trebizond that I've seen is " Turkish port".)

I've seen this clue in The Independent.

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