Suddenly appear when the arrival of the fizzy drink is announced (3-2)
I believe the answer is:
pop-up
'suddenly appear' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for pop-up that I've seen before include "(Annoying) feature appearing unexpectedly on a computer screen" , "temporary shop?" , "(Of a menu) visible when an option is chosen" , "Like many electric toasters" , "(Of toaster) automatically ejecting" .)