What does the cryptic crossword clue "Siren alerts cover this potentially fatal type of failure (5)" mean?

The definition is "potentially fatal type of failure". The wordplay uses a hidden word. Hidden in "siREN ALerts cover this potentially fatal type of failure" The answer is RENAL.

Siren alerts cover this potentially fatal type of failure (5)

Guardian Cryptic #29291 | 3 Down | 2024-01-29 flower

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