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Snack,
core
part
of
unsafe
carnal
diet
(6)
Snack, core part of unsafe carnal diet (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Snack, and SARNIE is British slang for a sandwich. The answer is built from the central letters ("core part") of three words: unSAfe gives SA, caRNal gives RN, and dIEt gives IE, which combine to make SARNIE.