Warning triangle is broken (8)

I believe the answer is:

alerting

'warning' is the definition.
(alerting is a kind of warning)

'triangle is broken' is the wordplay.
'is broken' indicates anagramming the letters.
'triangle' is an anagram of 'ALERTING'.

(Other definitions for alerting that I've seen before include "Warning" , "Notifying" .)

I've seen this clue in The Guardian.

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