Flowering bulb (5)
I believe the answer is:
tulip
'flowering bulb' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tulip that I've seen before include "Dutch bulb?" , "Bulbous plant" , "Plant, it's name shares an origin with turban" , "Plant of the lily family with a single showy flower" , "Popular garden flower from Amsterdam?" .)