20 across
Guiltless
about
Jack
Sprat’s
diet,
it’s
implied
(5)
Guiltless about Jack Sprat’s diet, it’s implied (5)
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The definition is at the beginning of the clue.
How the clue works
Guiltless is your definition, pointing to CLEAN, free of blame. For the wordplay, "about" gives you C (short for circa), and that's followed by LEAN — the diet Jack Sprat's stuck with in the nursery rhyme, since he could eat no fat.