Preparing a cheese grill? (7)

I believe the answer is:

grating

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'grill?' is the definition.
(I know that grill can be written as grating)

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

Can you help me to learn more?

(Other definitions for grating that I've seen before include "Jarring" , "Harsh sounding" , "Screen of bars across opening" , "Wearing away" , "Ring tag (anag.)" .)

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

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