Mustard named for a French city (5)
I believe the answer is:
dijon
'mustard named for a french city' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dijon that I've seen before include "French city - type of mustard" , "Source of mustard" , "Capital of the Burgundy region of eastern France" , "French town known for mustard" , "French home of mustard?" .)