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Of its kind, a crushingly big thing (5)

Ross

I believe the answer is:

molar

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'of' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I don't see?

I cannot understand how the rest of the clue works.

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

I've seen this clue in the Evening Standard.
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