What does the cryptic crossword clue "Heavy dieter to change? That's absurd! (3,4,4)" mean?

The wordplay uses an anagram. anagram of HEAVY + DIETER = THEVERYIDEA The answer is THEVERYIDEA.

Heavy dieter to change? That's absurd! (3,4,4)

Daily Mail Cryptic #17434 | 29 Across | 2024-08-29 flower