What does the cryptic crossword clue "Sign chat when broadcast is severely critical (8)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Sign chat when broadcast is severely critical (8)

Daily Mail Cryptic #17628 | 29 Across | 2025-05-28 flower

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