Father abandoned by that woman? That's rich! (3)
I believe the answer is:
fat
'rich' is the definition.
(rich can describe fat or creamy food)
'father abandoned by that woman?' is the wordplay.
'abandoned by' indicates named letters should be taken away.
'that woman?' becomes 'her' (her refers to a woman).
'father' with 'her' taken out is 'FAT'.
'that's' acts as a link.
(Other definitions for fat that I've seen before include "Corpulent; little (chance)" , "Substantial" , "Portly" , "Cooking grease" , "Obese, having spare tyre etc" .)