What may be spoken in North India? (5)

I believe the answer is:
hindi
'what may be spoken' is the definition.
I can't judge whether this definition defines the answer.
'in north india?' is the wordplay.
'in' says the answer is hidden in the clue.
'HINDI' is hidden within 'north india'.
Can you help me to learn more?
(Other definitions for hindi that I've seen before include "An official language of India" , "tongue" , "Indic language" , "Language derived from Sanskrit" , "Language of northern India" .)
