Thus Indian gets confused by the vernacular (10)
I believe the answer is:
hindustani
'the vernacular' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
'thus indian gets confused' is the wordplay.
'gets confused' is an anagram indicator.
'thus'+'indian'='thusindian'
'thusindian' is an anagram of 'HINDUSTANI'.
'by' is the link.
Can you help me to learn more?
(Other definitions for hindustani that I've seen before include "tongue" , "Dialect of Hindi" , "Converting device" , "Language" , "Indians" .)