Lahore language (4)
I believe the answer is:
urdu
'lahore language' 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 "Pakistani language" , "Language spoken by Moslems in Pakistan and India" , "An official language of Pakistan related to Hindi" , "Language used in Pakistan, India" , "Asian language written in Arabic script" .)