Senor's strange language (5)
I believe the answer is:
norse
'language' is the definition.
(Norse is an example)
'senor's strange' is the wordplay.
'strange' indicates an anagram.
'senor' is an anagram of 'NORSE'.
(Other definitions for norse that I've seen before include "like the Valkyries?" , "Viking" , "Old European" , "Snore (anag)" , "Ancient Scandinavian language" .)