Pakistani language (4)
I believe the answer is:
urdu
'pakistani language' 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 "Channel to north of Isle of Wight" , "Pakistani language" , "Analyse and develop (an idea) in detail" , "Sanskrit language" , "One of official languages of Pakistan" .)