Tsk! Flipping tantrum routine and it's upturned ice cream (5-6)

I believe the answer is:

tutti-frutti

I'm a little stuck... Click here to teach me more about this clue!

'ice cream' is the definition.
(I know that Tutti-frutti is a type of ice cream)

'tsk flipping tantrum routine and it's upturned' is the wordplay.
'tsk' becomes 'tut' (I've seen this in another clue).
'flipping tantrum' becomes 'tif' (I can't explain this - if you can you should give a lot more credence to this answer).
'routine' becomes 'rut' (being stuck in a rut is being stuck in a routine).
'and' says to put letters next to each other.
'upturned' says the letters should be written in reverse.
'it' back-to-front is 'ti'.
'tut'+'tif'+'rut'+'ti'='TUTTI-FRUTTI'

Can you help me to learn more?

(Other definitions for tutti-frutti that I've seen before include "Mixed fruit ice cream" , "Type of ice-cream" , "Ice cream variety" , "Type of Italian ice cream" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.