It's purely symbolic (4)
I believe the answer is:
lily
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for lily that I've seen before include "Flower of purity" , "Girl's name - plant with hanging flowers" , "Bulbous flowering plant" , "Bulbous plant with trumpet-shaped flowers" , "Plant with showy pendulous flowers" .)