Denouncer's unorthodox antics 'cool' (10)
I believe the answer is:
iconoclast
'denouncer's' is the definition.
(an iconoclast denounces things or people)
'unorthodox antics cool' is the wordplay.
'unorthodox' indicates anagramming the letters.
'antics'+'cool'='anticscool'
'anticscool' is an anagram of 'ICONOCLAST'.
(Other definitions for iconoclast that I've seen before include "Unorthodox thinker" , "heretic" , "A dissident" , "Debunker of reputations" , "Challenging type" .)