Woman who’s expecting? (7)
I believe the answer is:
heiress
'woman who's expecting?' is the definition.
(woman who expects to inherit something)
This is the entire clue.
(Other definitions for heiress that I've seen before include "He rises (anag.)" , "Female expecting to succeed" , "Woman destined to succeed!" , "One due to inherit" , "One who will inherit wealth" .)