Crossword Genius

On the lookout (5)

Ross

I believe the answer is:

alert

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">on the lookout</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for alert that I've seen before include "In state of watchfulness" , "Watchful and observant" , "Warning signal" , "Lively" , "alarm" .)

I've seen this clue in The Guardian and the LA Times.
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