One wearing tuxedo running French city (5)

I believe the answer is:

dijon

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'french city' is the definition.
(I know that Dijon is a metropolis)

'one wearing tuxedo running' is the wordplay.
'one' becomes 'i' (Roman numeral).
'wearing' indicates putting letters inside.
'tuxedo' becomes 'dj' (I am not sure about this - if you are sure you should believe this answer much more).
'running' becomes 'on' (eg when a machine is running it is on).
'i' placed into 'dj' is 'dij'.
'dij'+'on'='DIJON'

Can you help me to learn more?

(Other definitions for dijon that I've seen before include "French home of mustard?" , "French city associated with mustard" , "Source of mustard" , "French town known for mustard" , "Capital of the Burgundy region of eastern France" .)

I've seen this clue in The Telegraph.

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