Language related to Hindi (4)
I believe the answer is:
urdu
'language related to hindi' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for urdu that I've seen before include "An official language of Pakistan related to Hindi" , "One of official languages of Pakistan" , "Foreign language" , "Asian language written in Arabic script" , "Language closely related to Hindi" .)