Tooth part (4)
'tooth part' is the definition.
('root' is part of 'tooth')
This is the entire clue.
(Other definitions for root that I've seen before include "Underground part of a plant" , "Lowest part of plant" , "Turn up with the snout." , "Derivation" , "Reptile" .)
'tooth part' is the definition.
('enamel' is part of 'tooth')
This is all the clue.
(Other definitions for enamel that I've seen before include "Decorative inlay" , "Dental material" , "sort of paint" , "Hard-drying paint" , "hard cover" .)