Perfect female breaking all the rules (8)
I believe the answer is:
flawless
'perfect' is the definition.
(similar in meaning)
'female breaking all the rules' is the wordplay.
'female' becomes 'f' (common abbreviation).
'breaking all the rules' becomes 'lawless' (ignoring all laws).
'f'+'lawless'='FLAWLESS'
(Other definitions for flawless that I've seen before include "Without blemish or fault" , "unimpaired" , "Perfect, without defect" , "sinner isn't this" , "Impeccable" .)