Repellent sporting misdemeanour (4)
I believe the answer is:
foul
This clue could be a double definition.
'repellent' is the first definition.
(thesaurus)
'sporting misdemeanour' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for foul that I've seen before include "Disgusting" , "Vile" , "Abhorrent" , "Having offensive smell or taste" , "Offensive to the senses" .)