Scheduled to be born (3)
I believe the answer is:
due
'scheduled to be born' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for due that I've seen before include "Ripe for payment or arrival" , "Expected, scheduled" , "Escort" , "Appropriate - fee - requiring payment" , "Owed as a debt" .)