Bet Ron mangled language (6)
I believe the answer is:
breton
'language' is the definition.
(Breton is an example)
'bet ron mangled' is the wordplay.
'mangled' is an anagram indicator.
'bet'+'ron'='betron'
'betron' is an anagram of 'BRETON'.
(Other definitions for breton that I've seen before include "from Northern France" , "One from Brest" , "Cooked with cheese and/or breadcrumbs on top" , "French Celtic language" , "Person from Brittany" .)