Unblemished foreigner starting without rules (8)
I believe the answer is:
flawless
'unblemished' is the definition.
('flawless' can be a synonym of 'unblemished')
'foreigner starting without rules' is the wordplay.
'starting' suggests taking the first letters.
'without rules' becomes 'lawless' (I've seen this before).
The first letter of 'foreigner' is 'f'.
'f'+'lawless'='FLAWLESS'
(Other definitions for flawless that I've seen before include "Impeccable" , "Without blemish or imperfection" , "Unblemished" , "Immaculate" , "Without blemish or fault" .)