Snark and its peculiar language (8)
I believe the answer is:
sanskrit
'language' is the definition.
(Sanskrit is an example)
'snark and its peculiar' is the wordplay.
'and' is a charade indicator (letters next to each other) (I've seen this in other clues).
'peculiar' indicates an anagram.
'snark' put after 'its' is 'itssnark'.
'itssnark' with letters rearranged gives 'SANSKRIT'.
(Other definitions for sanskrit that I've seen before include "Ancient Indian language" , "Ancient language of Hindus in India" , "Ancient Indo-European language" , "Ancient Hindu tongue" , "Ancient official language of India" .)