Language of the French in Dijon (5)
I believe the answer is:
hindi
'language' is the definition.
(Hindi is an example)
'of the french in dijon' is the wordplay.
'of' says the answer is hidden in the clue.
'HINDI' is hidden within 'the french in dijon'.
(Other definitions for hindi that I've seen before include "Indian language" , "Ind. Language" , "Indic language" , "Asian language" , "language many use" .)