It can be heard in North India (5)
I believe the answer is:
hindi
'it can be heard' is the definition.
The definition suggests a singular noun which matches the answer.
'in north india' is the wordplay.
'in' says the answer is hidden in the clue.
'HINDI' can be found hidden inside 'north india'.
Can you help me to learn more?
(Other definitions for hindi that I've seen before include "It's spoken abroad" , "language many use" , "Language of northern India" , "tongue" , "An official language of India" .)