Crossword Genius

On one's toes (5)

Ross

I believe the answer is:

alert

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">on one's toes</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 "Warning signal" , "Signal danger" , "Watchful, sharp" , "'Attentive, vigilant (5)'" , "'Attentive, watchful (5)'" .)

I've seen this clue in The Mirror, the Newsday, the Penny Press, The Star Tribune and the Evening Standard.
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