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It's a big thing in dentistry (5)

Ross

I believe the answer is:

molar

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'dentistry' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

I don't understand the remainder of the clue.

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(Other definitions for molar that I've seen before include "that could be capped" , "Grinding tooth in the back of a mammal's mouth" , "Moral (anag.)" , "of ivory, perhaps" , "Type of tooth" .)

I've seen this clue in the Evening Standard.
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