Mega icon a twisted narcissist (9)
I believe the answer is:
egomaniac
'narcissist' is the definition.
(I've seen this in another clue)
'mega icon a twisted' is the wordplay.
'twisted' is an anagram indicator.
'mega'+'icon'+'a'='megaicona'
'megaicona' anagrammed gives 'EGOMANIAC'.
(Other definitions for egomaniac that I've seen before include "who's full of himself" , "Oneself, one would love" , "Highly self-absorbed person" , "he thinks "it's all about ME"" , "Excessively self-absorbed person" .)