Flower of the buttercup family (7)
I believe the answer is:
anemone
'flower of the buttercup family' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for anemone that I've seen before include "Woodland plant, eg the windflower" , "Plant with bright flowers" , "A flower; mean one (anag.)" , "Buttercup-like flower or sea animal" , "Flower; marine polyp" .)