WWII commando using Asian language in court (7)
I believe the answer is:
chindit
'wwii commando' is the definition.
(Chindits were British and Indian military units)
'asian language in court' is the wordplay.
'asian language' becomes 'Hindi' (one of the languages of India).
'in' is an insertion indicator.
'court' becomes 'ct' (abbreviation used in road names).
'hindi' going inside 'ct' is 'CHINDIT'.
'using' is the link.
(Other definitions for chindit that I've seen before include "Old fighter in Burma" , "WW2 allied commando in Burma" , "Burmese fighter" , "WW2 soldier" .)