Fancy Bute, also perfect (8)
I believe the answer is:
absolute
'perfect' is the definition.
('absolute' can be a synonym of 'perfect')
'fancy bute also' is the wordplay.
'fancy' indicates an anagram.
'bute'+'also'='butealso'
'butealso' anagrammed gives 'ABSOLUTE'.
(Other definitions for absolute that I've seen before include "Complete, total, without limits" , "No strings attached" , "Peremptory" , "Complete, full" , "Free from limits, power perhaps" .)