Tongue's fur due for scraping (4)
I believe the answer is:
urdu
'tongue's' is the definition.
(Urdu is a language or tongue)
'fur due for scraping' is the wordplay.
'URDU' is hidden within the letters.
But, I am not sure how this is indicated.
(Other definitions for urdu that I've seen before include "Pakistani tongue" , "Indian language" , "Sanskrit language" , "One of official languages of Pakistan" , "Official language used in Pakistan" .)