What does the cryptic crossword clue "Cook hot flan? You bet! (3,4)" mean?

The definition is "You bet!". The wordplay uses an anagram. anagram of HOT + FLAN? = NOTHALF; definition: "You bet!" The answer is NOTHALF.

Cook hot flan? You bet! (3,4)

Daily Mail Cryptic #16425 | 13 Across | 2020-10-15 flower