Is she a bit of a looker? (4)
I believe the answer is:
iris
I believe this clue is a double definition.
'is she' is the first definition.
(I've seen this before)
'a bit of a looker?' is the second definition.
(I've seen this before)
(Other definitions for iris that I've seen before include "Flag,flower and part of the eye" , "Female" , "Eye diaphragm" , "Eye part or attractive flower" , "Greek goddess of the rainbow" .)