Crossword Genius

Came up behind nurses beginning to operate (5)

Ross

I believe the answer is:

arose

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for arose that I've seen before include "Became apparent" , "Emerged from" , "Happened" , "Issued" , "Sprang up" .)

I've seen this clue in The Independent.
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