Language in Pakistan (4)
I believe the answer is:
urdu
'language in pakistan' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for urdu that I've seen before include "One of official languages of Pakistan" , "Official language used in Pakistan" , "Sub-continental language" , "Language akin to Hindi" , "Channel to north of Isle of Wight" .)