Good cat food spoiled is a disaster, naturally (3,2,3)
I believe the answer is:
act of god
'a disaster naturally' is the definition.
I can't judge whether this defines the answer.
'good cat food spoiled' is the wordplay.
'good' becomes 'g' (abbreviation).
'spoiled' indicates anagramming the letters.
'g'+'cat'+'food'='gcatfood'
'gcatfood' with letters rearranged gives 'ACT OF GOD'.
'is' is the link.
Can you help me to learn more?
(Other definitions for act of god that I've seen before include "Uncontrollable natural event like earthquate" , "naturally a disaster?" , "deus ex machina?" , "Event beyond human control" , "Natural catastrophe, force majeure" .)