Good French style (3)
I believe the answer is:
bon
'good french' is the definition.
('good' in French)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for bon that I've seen before include "Repeated, it's a tasty sweet" , "'At the double, it's a sweet, good for the French (3)'" , "C'est good in France" .)