Wisdom tooth, for instance (5)
I believe the answer is:
molar
'wisdom tooth for instance' is the definition.
(I know that wisdom teeth is a type of molar)
This is all the clue.
(Other definitions for molar that I've seen before include "Type of tooth" , "Grinding tooth in the back of a mammal's mouth" , "Dealing with masses" , "that could be capped" , "Moral (anag.)" .)