Tongue's fur due for scraping (4)
'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 "Language spoken by Moslems in Pakistan and India", "Foreign language", "An official language of Pakistan related to Hindi", "speech", "Sub-continental language".)