Wrong meal cooked — tongue! (3,6)
I believe the answer is:
low german
'tongue' is the definition.
(Low German is an example)
'wrong meal cooked' is the wordplay.
'cooked' indicates anagramming the letters (letters cooked into a new form).
'wrong'+'meal'='wrongmeal'
'wrongmeal' with letters rearranged gives 'LOW GERMAN'.
(Other definitions for low german that I've seen before include "European dialect" , "language" .)