Crossword Genius

Agent virtually upended into plant (4)

Ross

I believe the answer is:

iris

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'plant' is the definition.

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

Can you help me to learn more?

(Other definitions for iris that I've seen before include "Flag - flower - girl" , "Female" , "Coloured eye part" , "Fleur-de-lys" , "A flower; spirit conjured in Tempest" .)

I've seen this clue in The Telegraph.
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