Thoroughly defeat fat (5)
I believe the answer is:
cream
This clue might be a double definition.
'thoroughly defeat' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'fat' is the second definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for cream that I've seen before include "It rises to the top, the best" , "Thick milk" , "Elite; colour" , "Beat" , "Milk product" .)