Eccentric faker or aficionado (5)
I believe the answer is:
freak
'aficionado' is the definition.
(thesaurus)
'eccentric faker' is the wordplay.
'eccentric' is an anagram indicator.
'faker' anagrammed gives 'FREAK'.
'or' acts as a link.
(Other definitions for freak that I've seen before include "Aberration" , "Abnormality" , "Weirdo" , "One obsessed with a particular activity or interest" , "Monstrosity" .)