Yet to be delivered (2,5)
I believe the answer is:
in utero
'yet to be delivered' is the definition.
(still in the womb)
This is all the clue.
(Other definitions for in utero that I've seen before include "Within the womb - routine (anag)" , "Pre-natal position (Latin)" , "Before birth - routine (anag)" , "being developed" , "Before birth (Latin)" .)