Language of Lahore (4)
I believe the answer is:
urdu
'language of lahore' 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 "Form of Hindustani" , "Foreign language" , "speech" , "Indic language written in Persian script" , "Asian language written in Arabic script" .)