What does the cryptic crossword clue "A truism I debunked, sweet! (8)" mean?

The definition is "sweet!". The wordplay uses an anagram. anagram of A + TRUISM + I = TIRAMISU; definition: "sweet!" The answer is Tiramisu.

A truism I debunked, sweet! (8)

Telegraph Prize Cryptic #3071 | 16 Down | 2020-08-30 flower