Large-flowered bulb (9)
I believe the answer is:
amaryllis
'large-flowered bulb' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for amaryllis that I've seen before include "Showy bulbous plant" , "Sly alarm I turn on for the flower" , "Large-flowered bulb" , "Bulbous plant with trumpet-shaped flowers" , "belladonna lily brought this about" .)