Dispose of language of France (6,3)
I believe the answer is:
polish off
'dispose of' is the definition.
(I've seen this before)
'language of france' is the wordplay.
'language' becomes 'polish' (Polish is an example).
'france' becomes 'f'.
'polish'+'of'+'f'='POLISH OFF'
(Other definitions for polish off that I've seen before include "Dispose of" , "Finish completely - kill deliberately" , "Consume (something) quickly" , "Use varnish remover to get this" , "Finish (something) quickly" .)