Crossword Genius

Medical procedure that Yankee's after (1-3)

Ross

I believe the answer is:

x-ray

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This clue could be a double definition.

'medical' is the first definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'procedure that yankee's after' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
I also know that 'yankee' relates to this answer.

Can you help me to learn more?

(Other definitions for x-ray that I've seen before include "Aid to medical investigation" , "Internal "photo"" , "Roentgen photograph" , "Rontgen's discovery" , "Electromagnetic photograph" .)

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