Bill's extremely chubby, scoffing last of dessert after buffet (6)

'bill's' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'extremely chubby scoffing last of dessert after buffet' is the wordplay.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'scoffing' is an insertion indicator.
'last of' says to take the final letters.
'after' says to put letters next to each other.
'buffet' becomes 'hit' (buffet can mean to beat or pound).
'chubby' with its centre removed is 'cy'.
The final letter of 'dessert' is 't'.
't' after 'hit' is 'hitt'.
'cy' enclosing 'hitt' is 'CHITTY'.

Can you help me to learn more?