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 a hidden word.
'INCISOR' can be found hidden inside '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" .)