Noble Tim, a fencing freak (11)
I believe the answer is:
magnificent
'noble' is the definition.
(thesaurus)
'tim a fencing freak' is the wordplay.
'freak' indicates an anagram (a freakish form of the letters).
'tim'+'a'+'fencing'='timafencing'
'timafencing' with letters rearranged gives 'MAGNIFICENT'.
(Other definitions for magnificent that I've seen before include "Highly impressive" , "Splendid" , "Wonderful" , "Superb, imposing" , "Very beautiful, impressive" .)