A kind of tooth (5)
I believe the answer is:
molar
'a kind of tooth' is the definition.
(I know that molar is a type of tooth)
This is the entire clue.
(Other definitions for molar that I've seen before include "part of the daily grind" , "of ivory, perhaps" , "Moral (anag.)" , "Dealing with masses" , "Broad-crowned tooth" .)