Good, in Grenoble (3)
I believe the answer is:
bon
'good in grenoble' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bon that I've seen before include "'At the double, it's a sweet, good for the French (3)'" , "Repeated, it's a tasty sweet" , "C'est good in France" .)