What does the cryptic crossword clue "Confidence in dieter cut after wobble (9)" mean?

The definition is "Confidence". The wordplay uses an anagram. anagram of DIETER + CUT = CERTITUDE; definition: "Confidence" The answer is Certitude.

Confidence in dieter cut after wobble (9)

Telegraph Prize Cryptic #3047 | 26 Across | 2020-03-15 flower