BBC Asian Network language (4)
I believe the answer is:
urdu
'bbc asian network 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 "One of official languages of Pakistan" , "Sub-continental language" , "Language spoken by Moslems in Pakistan and India" , "Language used in Pakistan, India" , "Pakistani tongue" .)