Former setter finally getting pregnant (9)
I believe the answer is:
Here is my best explanation:
'pregnant' is the definition.
(I've seen this before)
'former setter finally getting' is the wordplay.
'former' becomes 'ex'.
'setter' becomes 'pectin' (I've seen this before**).
'finally' indicates one should take the final letters.
The final letter of 'getting' is 'g'.
(Other definitions for expecting that I've seen before include "Looking forward", "Regarding as likely to happen", "pregnant" and "Anticipating, looking forward to".)