Space for growth? (6)
(Other definitions for uterus that I've seen before include "Here, conceive" , "Latin name for the womb" , "The formal womb" , "space for internal development" , "Organ" .)
(Other definitions for incubator that I've seen before include "hospital apparatus" , "hospital equipment" , "baby care facility" , "Egg hatching apparatus" , "Artificial substitute for a hen's warmth" .)