Tooth revealing Da Vinci's original? Not entirely (7)
I believe the answer is:
incisor
'tooth' is the definition.
(I know that incisor is a type of tooth)
'da vinci's original? not entirely' is the wordplay.
'not entirely' indicates the answer is hidden within the clue.
'INCISOR' is hidden in the letters of 'da vincis original'.
'revealing' acts as a link.
(Other definitions for incisor that I've seen before include "Ivory perhaps" , "Type of tooth" , "Front tooth" , "One takes a bite" , "cutter" .)