Not sticking to his diet meant his belt no longer fit. To use it he’d need to Jumble Answer
From the July 13, 2021 Daily Jumble
The cartoon clue in the July 13, 2021 Daily Jumble was “Not sticking to his diet meant his belt no longer fit. To use it he’d need to” — and here is the punchline:
Punchline
BUCKLEDOWN