The flag lady? (4)
I believe the answer is:
iris
This clue is a double definition.
'the flag' is the first definition.
('iris' can be a synonym of 'flag')
'lady?' is the second definition.
(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" .)