Such a surgeon knows his drill (6)

I believe the answer is:

dental

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'such' is the definition.
Although both the answer and definition are adjectives, I cannot see how they can define each other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for dental that I've seen before include "Consonant" , "Relating to teeth" , "surgery" , "Pertaining to teeth" , "Concerning teeth" .)

I've seen this clue in The Globe and Mail.

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