A flower girl (6)
I believe the answer is:
violet
I believe this is a double definition.
'a flower' is the first definition.
(thesaurus)
'girl' is the second definition.
(Other definitions for violet that I've seen before include "Colour midway between red and blue" , "Rainbow colour; flower" , "Five-petalled flower" , "Bluish-purple colour as of pretty flower" , "Herbaceous flower" .)