Perfect finish (8)
I believe the answer is:
complete
This clue is a double definition.
'perfect' is the first definition.
(perfect and requiring no additional changes)
'finish' is the second definition.
(I know that finish can be written as complete)
(Other definitions for complete that I've seen before include "Whole and unabridged" , "Thorough" , "Finish; whole" , "Finished, entire" , "Intact" .)