Language of Pakistan (4)
I believe the answer is:
urdu
'language of pakistan' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for urdu that I've seen before include "Indic language written in Persian script" , "Indian language" , "Sub-continental language" , "Language akin to Hindi" , "Asian language written in Arabic script" .)