A bunch of kangaroos returned to one state. Disgrace! (11)
I believe the answer is:
abomination
'disgrace' is the definition.
(thesaurus)
'a bunch of kangaroos returned to one state' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
'of' could be 'o' and 'o' is found within the answer.
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'state' could be 'nation' (synonyms) and 'nation' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for abomination that I've seen before include "Feeling of hatred or disgust" , "Cause of hatred or disgust" , "Action that is vile" .)