Somebody from Interpol, say (11)
I believe the answer is:
personality
'somebody' is the definition.
(thesaurus)
'from interpol say' is the wordplay.
'from' indicates an anagram (from the letters).
'interpol'+'say'='interpolsay'
'interpolsay' anagrammed gives 'PERSONALITY'.
(Other definitions for personality that I've seen before include "(Distinctness of) character" , "Individual disposition" , "Distinctive character" , "Individual character" , "Celebrity" .)