Tulip-to-be (4)
I believe the answer is:
bulb
'tulip-to-be' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bulb that I've seen before include "Source of flower or light" , "Eg, onion" , "Reproductive organ in some plants" , "swelling" , "daffodil here" .)