Crossword Genius

Presidential candidate loses weight with microchip surgery (6)

Ross

I believe the answer is:

clinic

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'surgery' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for clinic that I've seen before include "Health centre" , "Place for specialised treatment or advice" , "Place or session at which treatment or advice is given" , "Doctor's session" , "medical department" .)

I've seen this clue in The Guardian.
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