Fizzy drink overflowing in round dish (6)
I believe the answer is:
adonis
'dish' is the definition.
(I've seen this before)
'fizzy drink overflowing in round' is the wordplay.
'fizzy drink' becomes 'soda' (soda is a fizzy drink).
'overflowing' becomes 'in' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'round' says the letters should be written backwards.
'soda' enclosing 'in' is 'sinoda'.
'sinoda' in reverse letter order is 'ADONIS'.
Can you help me to learn more?
(Other definitions for adonis that I've seen before include "Hunk" , "A very handsome legendary Greek" , "Handsome youth - said no (anag)" , "Most 8 Greek youth" , "legendary Greek noted for good looks" .)