I playact outrageously - that's not normal (8)
I believe the answer is:
atypical
'that's not normal' is the definition.
(I've seen this before)
'i playact outrageously' is the wordplay.
'outrageously' is an anagram indicator.
'i'+'playact'='iplayact'
'iplayact' anagrammed gives 'ATYPICAL'.
(Other definitions for atypical that I've seen before include "Not representative or conforming to the norm" , "Odd" , "out of character" , "Not characteristic" , "Not normal" .)