11 across
Most
cold
sauce
ingredients
initially
tasty
(9)
Most cold sauce ingredients initially tasty (9)
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The definition is at the beginning of the clue.
How the clue works
See Most cold sitting there at the start — that's your definition, pointing to "chilliest". For the wordplay, take CHILLIES as the sauce ingredients, then just tack on T, the initial letter of 'tasty', onto the end to get the full answer.