Crossword Genius

Flag Alexa's competitor raised (4)

Ross

I believe the answer is:

iris

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

'flag' is the definition.
(type of iris flower)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for iris that I've seen before include "Coloured part of the lamp" , "Nice flower or eye part" , "Goddess of the rainbow in the eye" , "Lily" , "Flower and eye membrane" .)

I've seen this clue in The Telegraph.
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