Crossword Genius

Like good sentries (5)

Ross

I believe the answer is:

alert

'like good sentries' 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 "Watchful; warning" , "Prompt" , "Put on guard, warn" , "alarm" , "Wide-awake and watchful" .)

I've seen this clue in The Chronicle of Higher Education, The Wall Street Journal and the King Feature Syndicate.
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