European's wild anger about 'Monsieur' (6)
I believe the answer is:
german
'european's' is the definition.
(German is an example)
'wild anger about monsieur' is the wordplay.
'wild' is an anagram indicator.
'about' indicates putting letters inside.
'monsieur' becomes 'm' (French abbreviation - like Mr for Mister).
'anger' with letters rearranged gives 'geran'.
'geran' placed around 'm' is 'GERMAN'.
(Other definitions for german that I've seen before include "Middle European, for example" , "Goethe's language" , "Manger (anag.)" , "foreign" , "Composer, English? Yes" .)