Crossword Genius

Visits doctor for operation - what could go wrong? (5,2)

Ross

I believe the answer is:

drops in

I'm a little stuck... Click here to teach me more about this clue!

'visits' is the definition.
(dropping in is a kind of visiting)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for drops in that I've seen before include "Comes to see" , "Calls casually" , "eye thus getting less inflamed?" , "Casually visits" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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