Meadow flower (9)
I believe the answer is:
buttercup
'meadow flower' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for buttercup that I've seen before include "weedy type" , "Common grassland plant, poisonous to livestock" , "Common yellow meadow plant" , "Rich yellow wild flower" , "Common yellow flower" .)