Warned (7)

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alerted

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

This is the entire clue.

(Other definitions for alerted that I've seen before include "Put on guard, warned" , "Given signal" , "Warned or aroused to a sense of danger" , "Warned, made aware" , "Put on guard, forewarned" .)

I've seen this clue in The Sun, the Penny Press, The Telegraph and The Star Tribune.

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