Chuck out every other bit of your cake, it’s gross! (4)
I believe the answer is:
yuck
'gross' is the definition.
I know nothing about this answer so I can't judge whether this works.
'chuck out every other bit of your cake it's' is the wordplay.
'chuck' indicates anagramming the letters (I've seen 'chucked' mean this (letters chucked around)).
'every other' means one should take alternating letters (every other letter).
'bit of' says to take the initial letters.
'it's' becomes 'k' (I can't explain this - if you can you should believe this answer much more).
The first letters of 'your cake' is 'yc'.
The alternate letters of 'out' are 'u'.
'u'+'yc'='uyc'
'uyc' is an anagram of 'yuc'.
'yuc'+'k'='YUCK'
Can you help me to learn more?
(Other definitions for yuck that I've seen before include "Disgusting (interj.)" , "Ugh!" , "Expression of disgust; rhymes with male deer" , "That's disgusting!" , "Exclamation of disgust" .)