Taste of sugar, say: one floats up when cooked (11)

I believe the answer is:

teaspoonful

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

'taste of sugar' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'one floats up when cooked' is the wordplay.
'when cooked' indicates anagramming the letters.
'one'+'floats'+'up'='onefloatsup'
'onefloatsup' is an anagram of 'TEASPOONFUL'.

'say' is the link.

Can you help me to learn more?

(Other definitions for teaspoonful that I've seen before include "Small volume" , "Small amount" , "modicum of liquid" .)

I've seen this clue in The Telegraph.

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.