Crossword Genius

She may well be blue (4)

Ross

I believe the answer is:

iris

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

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for iris that I've seen before include "Flower and eye membrane" , "Eye part or attractive flower" , "One controlling pupil' s reactions" , "Eye part or pretty flower" , "Goddess of the rainbow in the eye" .)

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