Diminutive couple in a French city (5)

I believe the answer is:

dijon

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'a french city' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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

I've seen this clue in the Evening Standard.

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