Tongue stuffing in bulghur dumplings (4)
I believe the answer is:
urdu
'tongue' is the definition.
(Urdu is a language or tongue)
'stuffing in bulghur dumplings' is the wordplay.
'stuffing' indicates a hidden word.
'URDU' is hidden in the letters of 'in bulghur dumplings'.
(Other definitions for urdu that I've seen before include "Language closely related to Hindi" , "Indic language written in Persian script" , "Language used in Pakistan, India" , "Channel to north of Isle of Wight" , "Indian language" .)