Crossword Genius

Red (5)

Ross

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3 4

5

6 7 8 9

(Other definitions for alert that I've seen before include "Put on guard, warn" , "Intellectually active" , "alarm" , "Wakeful, observant" , "sharp-witted" .)

I've seen this clue in the Evening Standard, the Canadiana and the Penny Press.
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