Loud, unruly, yet without fault (8)
I believe the answer is:
flawless
'without fault' is the definition.
('fault' can be 'flaw' (synonyms) so maybe 'without fault' can be ''flawless')
'loud unruly' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'unruly' becomes 'lawless' (I've seen this before).
'f'+'lawless'='FLAWLESS'
'yet' acts as a link.
(Other definitions for flawless that I've seen before include "Immaculate" , "Perfect, without defect" , "Impeccable" , "Unblemished" , "unimpaired" .)