Parsee not used to this language (9)
I believe the answer is:
esperanto
'this language' is the definition.
(Esperanto is an example)
'parsee not used' is the wordplay.
'used' indicates an anagram.
'parsee'+'not'='parseenot'
'parseenot' is an anagram of 'ESPERANTO'.
'to' acts as a link.
(Other definitions for esperanto that I've seen before include "common language" , "Language invented by Dr Zamenhof" , "Linguistic invention" , "Personate (anag.)" , "Parse note in the artificial language" .)