Mustard option (5)
I believe the answer is:
dijon
'mustard option' 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 well-known for mustard" , "Source of mustard" , "French home of mustard?" , "City of eastern France, known for mustard" , "French city renowned for mustard" .)