Crossword Genius

Attentive

Ross

I believe the answer is:

'attentive' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for alert that I've seen before include "Danger warning" , "Put on guard, warn" , "Thinking and acting quickly" , "sharp-witted" , "Watchful and observant" .)

I've seen this clue in the Evening Standard, The New York Times, The Telegraph and the Newsday.
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