She's four-fifths Hibernian! (4)

I believe the answer is:

iris

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This clue might be a double definition.

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

'four-fifths hibernian' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Other definitions for iris that I've seen before include "Pupil's place?" , "Female" , "Flag,flower and part of the eye" , "is 21[WOMAN], perhaps" , "bit of mince pie" .)

I've seen this clue in the Evening Standard.

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