Growing need? (4)
I believe the answer is:
seed
'growing need?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for seed that I've seen before include "It can develop into a plant" , "- Pearl; - capital" , "Propagative part of plant" , "Germ; beginning" , "High-ranked player in a knock-out tournament" .)