The flag lady (4)
I believe the answer is:
iris
This clue is a double definition.
'the flag' is the first definition.
(type of iris flower)
'lady?' is the second definition.
(woman's name)
(Other definitions for iris that I've seen before include "Greek goddess of the rainbow" , "Lily" , "Fleur-de-lys" , "Flower and eye membrane" , "In the middle of which pupil is opening" .)