Nice man noir muse destroyed? (8)
I believe the answer is:
monsieur
'nice man' is the definition.
(equivalent to mister in French - eg in Nice)
'noir muse destroyed?' is the wordplay.
'destroyed?' indicates anagramming the letters.
'noir'+'muse'='noirmuse'
'noirmuse' is an anagram of 'MONSIEUR'.
(Other definitions for monsieur that I've seen before include "Frenchman" , "French male title" , "A French mister" , "Frenchman's title" , "French man" .)