White flower (8)
'white flower' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for snowdrop that I've seen before include "Wood anemone" , "Late winter flower" , "Small white flower of early spring" , "A blooming" , "Spring plant with bell-shaped flowers" .)
(Other definitions for gardenia that I've seen before include "Fragrant tree or shrub" , "Bad drainage produces a fragrant flower" , "Bad drainage can produce a fragrant flower" , "Drainage (anag) -- plant" , "Shrub with fragrant flowers - in Grade A (anag)" .)