Crossword Genius

Dentists may resort to this procedure (5)

Ross

I believe the answer is:

drill

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'this procedure' is the definition.
(I have seen 'correct procedure' mean 'drill' so perhaps 'procedure' could also mean 'drill')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for drill that I've seen before include "Square-bashing" , "Twilled cotton; soldiers' exercise" , "Seed machine; baboon" , "Procedure - practice" , "Twill-weave cotton cloth" .)

I've seen this clue in The Sun.
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