Crossword Genius

Thoroughly defeat fat (5)

Ross

I believe the answer is:

cream

I'm a little stuck... Click here to teach me more about this clue!

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" .)

I've seen this clue in the Sydney Morning Herald.
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