Person ate pickled tongue (9)
I believe the answer is:
esperanto
'tongue' is the definition.
(I've seen this before)
'person ate pickled' is the wordplay.
'pickled' indicates an anagram (I've seen this in other clues).
'person'+'ate'='personate'
'personate' anagrammed gives 'ESPERANTO'.
(Other definitions for esperanto that I've seen before include "Artificial speech-form" , "words, set up artificially?" , "Artificial language invented for international use" , "artificial tongue" , "Linguistic invention" .)