Plant ovule (4)
I believe the answer is:
seed
'plant ovule' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for seed that I've seen before include "One of the outstanding players in a tournament" , "It can develop into a plant" , "who is ranked highly" , "High-ranked player in a knock-out tournament" , "Local escorted" .)