Crumbs delivering nourishment (8)
I believe the answer is:
goodness
This clue is a double definition.
'crumbs' is the first definition.
(both are exclamations of surprise)
'nourishment' is the second definition.
'delivering' acts as a link.
(Other definitions for goodness that I've seen before include "Quality of being morally good or virtuous" , "Virtue, righteousness" , "merit" , "Virtue, rightness" , "Morality, generosity, kindness" .)