Crossword Genius

Increases in critical incidents after leader has fled (5)

Ross

I believe the answer is:

rises

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'increases' is the definition.
(I know this)

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

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(Other definitions for rises that I've seen before include "Moves upward" , "Moves upwards" , "Comes or goes upward" , "Gets up" , "Ascends" .)

I've seen this clue in The Guardian.
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