Cut cake up (4)
I believe the answer is:
snub
This might be a double definition.
'cut' is the first definition.
(synonyms)
'cake up' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
Can you help me to learn more?
(Other definitions for snub that I've seen before include "Rebuff; brush-off" , "Reject or humiliate person" , "Reject greeting, seek to humiliate" , "Rebuff or reject overture" , "Rude put-down; blunt (nose)" .)